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Subject: Basic Sciences

  • What is Federated Learning?

    An improvement in a Machine Learning (ML) model, called ‘federated learning’, is said to enable companies to develop new ways of collecting anonymous data without compromising their privacy.

    Data privacy is the right of a citizen to have control over how personal information is collected and used. Data protection is a subset Right of Privacy under Article 21 of the Indian Constitution.

    What is ‘federated learning’?

    • Federated learning is an ML method used to train an algorithm across multiple decentralised devices or servers holding data samples.
    • It doesn’t exchange data with the devices, meaning there is no central dataset or server that stores the information.
    • Standard ML models require all data to be centralised in a single server. Implementation of federated learning eliminates the need for maintaining a storage hub.
    • The term was first introduced in a 2016 Google study titled ‘Communication-efficient learning of deep networks from decentralized data.’
    • Google emphasised mobile phones and tablets, stating that modern devices contain special features like speech recognition and image models that can store large amounts of data.
    • Since then, Google has used the technique is various products, including Gboard, which provides text and phrase suggestions to the keyboard.

    How this works

    • Federated learning aims to train an algorithm, like deep neural networks, on multiple local datasets contained in local nodes, without explicitly exchanging data.
    • The general principle involves simply exchanging parameters between these nodes. Parameters include a number of federated learning rounds, the total number of nodes, and learning rate.
    • The distinct advantage of the model is its ability to reduce privacy and security risks by limiting the attack surface to only the device, rather than the device and the cloud, Google stated in the study.

    Why need such technology?

    • Smart home devices like speakers and smartwatches collect and share data with other devices and systems over the network.
    • These Internet of Things (IoT) devices are equipped with sensors and software that store a user’s private information like body measurements and location.
    • This large chunk of stored data is used by the device makers to improve their products and services.

    Applications

    • Federated learning is said to have application in healthcare, where hospitals and pharmaceutical companies can exchange data for treating diseases without sharing private clinical information.

  • Needed, a policy framework in step with technology

    The changing realm of technology requires a change in the policy framework. The article discusses the issue of the impact of technology and the required changes in the policy framework.

    Adoption of information-based technologies

    • The expansion of computing power has driven the pace of information gathering and analysis.
    • The new currency drives processes and decision-making across a wide array of products and services, making them more efficient and value accretive for consumers.
    • These information-based technologies have been widely adopted across a broad range of industries and products that traditionally have not been perceived as electronic or software based.
    •  A modern automobile has 40% of its component value from electronic-based products.
    • This is a paradigm shift as the amount of “value add” from intangible technology services as opposed to physical objects, even in traditional goods, is being transformed by information.
    • Information and electronics are becoming all-pervasive, ensuring that we set boundaries to control quality or the uptime of the equipment.
    • Information availability drives efficiency and creates value for customers by providing greater control over the product
    • There is increasing digitisation and electronification of industrial activities, products and services, influencing the evolving skill sets in industry.

    Need for holistic views in policies

    • To address the needs of various stakeholders, governments have tended to build specialised departments and designed policies that govern those areas.
    • Over time, as each of these departments grew, they have tended to operate in silos.
    • The recent developments in technology have, however, blurred standard boundaries that dictate policy framework in most governments.
    • As technology is driving an increasing share of the value add coming from digitisation and data analytics, there needs to be a way of encouraging capital formation by way of intangibles in traditionally tangible industries.
    • There is a need to have a holistic view of policies for economic development as technology is becoming a significant enabler in most industries.
    • A change in policy framework regarding economic development that enables various ministries to work together is essential.

    Way forward

    • A nourishing ecosystem for industry, including the hard infrastructure and softer areas such as education, skilling, technical institutions, laboratories, testing centres, etc., has to be cultivated.
    • The creation of clusters of companies in adjacent but complementary areas could constitute such an ecosystem that encourages multi and cross-disciplinary learning and spur innovation and economic development.
    • Moreover, this type of ecosphere could also attract investment and capital formation.
    • There is also the larger issue of a shift of value between manufacturing and services as technology changes.
    • The policy, by and large, promotes and gives incentives for manufacturing, whereas the share of intangibles are not adequately covered in industrial policies.
    • It is important to include these to encourage innovation and technological development.
    • It is important that there is close cooperation and alignment between the Centre and State to ensure effective implementation on the ground.

    Conclusion

    Some of these thoughts could help us navigate through an ecosystem that is changing with technology.

  • Thirty Metre Telescope (TMT)

    With regime change in the US, hopes have been raised for the Thirty Meter Telescope (TMT) in Hawaii. India is one of the partners in the ambitious next-generation observatory project along with the US, Canada, China and Japan.

    Try this PYQ:

    Q.“Event Horizon” is related to:

    (a) Telescope

    (b) Black hole

    (c) Solar glares

    (d) None of the above

    Thirty Metre Telescope

    • The TMT is a proposed astronomical observatory with an extremely large telescope (ELT) that has become the source of controversy over its planned location on Mauna Kea on the island of Hawaii.
    • It is being built by an international collaboration of government organisations and educational institutions, at a cost of $1.4 billion.
    • “Thirty Metre” refers to the 30-metre diameter of the mirror, with 492 segments of glass pieced together, which makes it three times as wide as the world’s largest existing visible-light telescope.
    • The larger the mirror, the more light a telescope can collect, which means, in turn, that it can “see” farther, fainter objects.
    • It would be more than 200 times more sensitive than current telescopes and would be able to resolve objects 12 times better than the Hubble Space Telescope.

    Utility of the telescope

    • One of its key uses will be the study of exoplanets, many of which have been detected in the last few years, and whether their atmospheres contain water vapour or methane — the signatures of possible life.
    • For the first time in history, this telescope will be capable of detecting extraterrestrial life.
    • The study of black holes is another objective.
    • While these have been observed in detail within the Milky Way, the next galaxy is 100 times farther away; the Thirty Metre Telescope will help bring them closer.

  • What is Einstein’s Eclipse?

    This newscard is an excerpt from the original article published in the DownToEarth.

    Einstein’s Eclipse

    • Albert Einstein’s prediction of the bending of light by the gravity of the Sun, one of the components of his general theory of relativity, can be tested during a solar eclipse.
    • Following an unsuccessful attempt to validate this prediction during the Solar eclipse of June 8, 1918, two expeditions were made to measure positions of stars during this eclipse.
    • The eclipse presented a rare chance to verify one of the essential consequences of general relativity, the bending of light by gravity.
    • Einstein’s theory predicted that rays of light passing near a massive body in space would be visibly bent as they followed the curve in space-time created by the body’s mass.
    • In the case of a ray of light originating from a distant star and passing near the edge of the Sun, Einstein calculated a deflection of about 1.75 arc seconds.

    Try this PYQ:

    Q.Consider the following phenomena:

    1. Light is affected by gravity.
    2. The Universe is constantly expanding.
    3. Matter warps its surrounding space-time.

    Which of the above is/are the predictions of Albert Einstein’s General Theory of Relativity, often discussed in media?

    (a) 1 and 2 only

    (b) 3 only

    (c) 1 and 3 only

    (d) 1, 2 and 3

    What was studied during the eclipse?

    • Einstein published his theory and predictions in 1915, and in 1919 the British physicist Sir Arthur Eddington took advantage of a total solar eclipse to attempt to detect the shifting images of stars near the limb of the sun.
    • The problem was that during totality the sky does not get perfectly dark, and only a handful of stars were visible near the sun from which to make the measurement.
    • The darkness of an eclipse, though, would allow the astronomers to observe and photograph the field of stars around the Sun.
    • By comparing the photographs with reference images taken at night, it would be possible to measure how much the presence of the Sun had bent the stars’ light.
    • Conveniently, a cluster of bright stars known as the Hyades would appear near the Sun during the eclipse.

    Significance

    • After several months of analysis, researchers announced in November that their findings supported the theory of general relativity.
    • Media coverage tended to dwell on the recondite nature of Einstein’s work, emphasizing that there were only a handful of people in the world who could understand it.
    • It could be argued that 1919 was the year when Einstein’s name became a byword for superhuman intellectual ability—making possible the small industry of Einstein-themed merchandise that still exists today.

    Back2Basics: General Relativity

    • Einstein’s theory proposes that gravity is not an actual force, but is instead a geometric distortion of space-time not predicted by ordinary Newtonian physics.
    • The more mass you have to produce the gravity in a body, the more distortion you get.
    • This distortion changes the trajectories of objects moving through space, and even the paths of light rays, as they pass close-by the massive body.
    • Even so, this effect is very feeble for an object as massive as our own sun, so it takes enormous care to even detect that it is occurring.
    • General Relativity predicts how much of this bending of light you should see given the mass of the object.
    • Called ‘gravitational lensing’ it has been detected on the cosmological scale as entire clusters of galaxies distort the light from more distant galaxies behind them as this image from the Hubble Space Telescope shows.

  • [pib] POWER Initiative

    The Union Minister for Science & Technology has launched a Scheme titled SERB-POWER (Promoting Opportunities for Women in Exploratory Research).

    Try this MCQ:

    Q.The POWER initiative sometimes seen in news is related to

    a)Reforms in the DISCOMs

    b)Renewable Energy Sector

    c)Women Empowerment

    d)Health Sector

    POWER Initiative

    • It is a scheme to mitigate gender disparity in science and engineering research funding in various S&T programs in Indian academic institutions and R&D laboratories.
    • The Science and Engineering Research Board (SERB), a statutory body of the DST has been contemplating to institute a scheme to mitigate gender disparity in science and engineering.
    • SERB – POWER Scheme will have two components namely (i) SERB-POWER Fellowship (ii) SERB- POWER Research Grants.

    A. Salient features of the SERB-POWER Fellowship

    1. Target: Women researchers in 35-55 years of age. Up-to 25 Fellowships per year and not more than 75 at any point in time.
    2. Components of support: Fellowship of Rs. 15,000/- per month in addition to regular income; Research grant of Rs. 10 lakh per annum; and Overhead of Rs. 90,000/- per annum.
    3. Duration: Three years, without the possibility of extension. Once in a career.

    B. Salient features of the SERB – POWER Research Grants

    POWER Grants will empower women researchers by funding them under the following two categories:

    1. Level I (Applicants from IITs, IISERs, IISc, NITs, Central Universities, and National Labs of Central Government Institutions): The scale of funding is up to 60 lakhs for three years.
    2. Level II (Applicants from State Universities / Colleges and Private Academic Institutions): The scale of funding is up to 30 lakhs for three years.

    Why need such a scheme?

    • Integration of the gender dimension in research design has gained considerable attention in the global scenario.
    • Enhancement of participation and promotion of women in the research workforce has to be one of the prime priorities.

  • Species in news: Pelagornithids

    Scientists have identified the fossil of a giant bird that lived about 50 million years ago, with wingspans of up to 21 feet that would dwarf today’s largest bird, the wandering albatross.

    Try this PYQ:

    Q.The term “Sixth mass extinction/ sixth extinction is often mentioned in the news in the context of the discussion of

    (a) Widespread monoculture practices in agriculture and large-scale commercial farming with indiscriminate use of chemicals in many parts of the world that may result in the loss of good native ecosystems.

    (b) Fears of a possible collision of a meteorite with the Earth in the near future in the manner it happened 65 million years ago that caused the mass extinction of many species including those of dinosaurs.

    (c) Large scale cultivation of genetically modified crops in many parts of the world and promoting their cultivation in other parts of the world which may cause the disappearance of good native crop plants and the loss of food biodiversity.

    (d) Mankind’s over-exploitation/misuse of natural resources, fragmentation/loss of natural habitats, destruction of ecosystems, pollution and global climate change.

    Pelagornithids

    • Called Pelagornithids, the birds filled a niche much like that of today’s albatrosses and travelled widely over Earth’s oceans for at least 60 million years.
    • They are known as ‘bony-toothed’ birds because of the bony projections, or struts, on their jaws that resemble sharp-pointed teeth, though they are not true teeth, like those of humans and other mammals.
    • The bony protrusions were covered by a horny material, keratin, which is like our fingernails, the researchers said.
    • Called pseudoteeth, the struts helped the birds snag squid and fish from the sea as they soared for perhaps weeks at a time over much of Earth’s oceans, they said.

    Their extinction

    • The pelagornithids came along to claim the wingspan record in the Cenozoic, after the mass extinction and lived until about 2.5 million years ago. Around that same time, teratogens, now extinct, ruled the skies, they said.
    • The newly described fossil — a 50 million-year-old portion of a bird’s foot — shows that the larger Pelagornithids arose just afterlife rebounded from the mass extinction 65 million years ago, when the dinosaurs, went extinct.
    • The last known pelagornithid is from 2.5 million years ago, a time of changing climate as Earth cooled, and the ice ages began.

  • Room Temperature Superconductivity

    A study has shown that a new material superconducts at 15 degrees Celsius but at extremely high pressure.

    In India, we often get to hear about the transmission losses in DISCOMS. Such losses can be zeroed with the application of superconducting cables (which is practically impossible unless we find a normal working one). The phenomena, superconductivity, however, is not new to us, UPSC may end up asking some tricky statements in the prelims regarding it.

    What is Superconductivity?

    • A superconductor is a material, such as a pure metal like aluminium or lead, that when cooled to ultra-low temperatures allows electricity to move through it with absolutely zero resistance.
    • Kamerlingh Onnes was the first scientist who figured out exactly how superconductor works in 1911.
    • Simply put, superconductivity occurs when two electrons bind together at low temperatures.
    • They form the building block of superconductors, the Cooper pair.
    • This holds true even for a potential superconductor like lead when it is above a certain temperature.

    What is the new material?

    • A new material composed of carbon, hydrogen and sulphur superconducts at 15 degrees Celsius.
    • However, it needs ultrahigh pressure of about 2 million atmospheres to achieve this transition, putting off any thoughts of application to the future.
    • The pressure they needed was 267 Gigapascals (GPa), or 2.6 million atmospheres.
    • The pressure at the centre of the Earth is 360 GPa, so it is 75% of the pressure at the centre of the Earth.

    What are Superconductors?

    • Superconductors are materials that address this problem by allowing energy to flow efficiently through them without generating unwanted heat.
    • They have great potential and many cost-effective applications.
    • They operate magnetically levitated trains, generate magnetic fields for MRI machines and recently have been used to build quantum computers, though a fully operating one does not yet exist.

    Issues with superconductors

    • They have an essential problem when it comes to other practical applications: They operate at ultra-low temperatures.
    • There are no room-temperature superconductors. That “room-temperature” part is what scientists have been working on for more than a century.
    • The amount of energy needed to cool a material down to its superconducting state is too expensive for daily applications.

  • NASA’s OSIRIS-REx lands on Asteroid Bennu

    NASA’s OSIRIS-REx spacecraft briefly touched asteroid Bennu, from where it is meant to collect samples of dust and pebbles and deliver them back to Earth in 2023.

    The OSIRIS-REx mission

    • OSIRIS-REx stands for Origins, Spectral Interpretation, Resource Identification, Security, Regolith Explorer. This is NASA’s first mission meant to return a sample from the ancient asteroid.
    • The mission is essentially a seven-year-long voyage and will conclude when at least 60 grams of samples are delivered back to the Earth.
    • As per NASA, the mission promises to bring the largest amount of extraterrestrial material back to our planet since the Apollo era.
    • The mission was launched in 2016, it reached its target in 2018 and since then, the spacecraft has been trying to match the velocity of the asteroid using small rocket thrusters to rendezvous it.
    • This week, the spacecraft’s robotic arm called the Touch-And-Go Sample Acquisition Mechanism (TAGSAM), made an attempt to “TAG” the asteroid and collected a sample.

    About Bennu

    • Bennu is a B-type asteroid, implying that it contains significant amounts of carbon and various other minerals.
    • It was discovered by a team from the NASA-funded Lincoln Near-Earth Asteroid Research team in 1999.
    • Because of its high carbon content, the asteroid reflects about four per cent of the light that hits it, which is very low when compared with a planet like Venus, which reflects about 65 per cent of the light. Earth reflects about 30 per cent.
    • Around 20-40 per cent of Bennu’s interior is empty space and scientists believe that it was formed in the first 10 million years of the solar system’s formation, implying that it is roughly 4.5 billion years old.

    Why are scientists studying asteroid Bennu?

    • Bennu is an asteroid about as tall as the Empire State Building and located at a distance of about 200 million miles away from the Earth.
    • Scientists study asteroids to look for information about the formation and history of planets and the sun since asteroids were formed at the same time as other objects in the solar system.
    • Another reason for tracking them is to look for asteroids that might be potentially hazardous. It is also relatively close to the Earth.
    • It is for these reasons that scientists are interested in gathering information about this particular asteroid.
    • Significantly, Bennu hasn’t undergone drastic changes since its formation over billions of years ago and therefore it contains chemicals and rocks dating back to the birth of the solar system.

    How do chemicals and rocks offer scientists clues about the solar system?

    • Because of Bennu’s age, it is likely to contain material that contains molecules that were present when life first formed on Earth, where life forms are based on carbon atom chains.
    • Even so organic material like the kind scientists hope to find in a sample from Bennu doesn’t necessarily always come from biology.
    • It would, though, further scientists’ search to uncover the role asteroids rich in organics played in catalyzing life on Earth.

    Back2Basics: Asteroid

    • Asteroids are rocky objects that orbit the Sun, much smaller than planets. They are also called minor planets.
    • According to NASA, 994,383 is the count of known asteroids, the remnants from the formation of the solar system over 4.6 billion years ago.
    • Asteroids are divided into three classes. First, those found in the main asteroid belt between Mars and Jupiter, which is estimated to contain somewhere between 1.1-1.9 million asteroids.
    • The second group is that of Trojans, which are asteroids that share an orbit with a larger planet.
    • The third classification is Near-Earth Asteroids (NEA), which have orbits that pass close by the Earth. Those that cross the Earth’s orbit are called Earth-crossers.
    • More than 10,000 such asteroids are known, out of which over 1,400 are classified as potentially hazardous asteroids (PHAs).

  • National Supercomputing Mission (NSM)

    The Centre for Development of Advanced Computing (C-DAC) has launched the second phase of the ambitious National Supercomputing Mission (NSM).

    Tap to read more about National Supercomputing Mission (NSM):

    [pib] National Supercomputing Mission (NSM)

    National Supercomputing Mission (NSM)

    • NSM is a proposed plan by GoI to create a cluster of seventy supercomputers connecting various academic and research institutions across India.
    • In April 2015 the government approved the NSM with a total outlay of Rs.4500 crore for a period of 7 years.
    • The mission was set up to provide the country with supercomputing infrastructure to meet the increased computational demands of academia, researchers, MSMEs, and startups by creating the capability design, manufacturing, of supercomputers indigenously in India.
    • Currently, there are four supercomputers from India in the Top 500 list of supercomputers in the world.

    Aims and objectives

    • The target of the mission was set to establish a network of supercomputers ranging from a few Tera Flops (TF) to Hundreds of Tera Flops (TF) and three systems with greater than or equal to 3 Peta Flops (PF) in academic and research institutions of National importance across the country by 2022.
    • This network of Supercomputers envisaging a total of 15-20 PF was approved in 2015 and was later revised to a total of 45 PF (45000 TFs), a jump of 6 times more compute power within the same cost and capable of solving large and complex computational problems.

    What is a Supercomputer?

    • A supercomputer is a computer with a high level of performance as compared to a general-purpose computer.
    • The performance of a supercomputer is commonly measured in floating-point operations per second (FLOPS) instead of million instructions per second (MIPS).
    • Since 2017, there are supercomputers which can perform over a hundred quadrillion FLOPS (petaFLOPS).
    • Since November 2017, all of the world’s fastest 500 supercomputers run Linux-based operating systems.

    Why do we need supercomputers?

    • Tackle problems: Developed and almost-developed countries have begun ensuring high investments in supercomputers to boost their economies and tackle new social problems.
    • These high-performance computers can simulate the real world, by processing massive amounts of data, making cars and planes safer, and more fuel-efficient and environment-friendly.
    • They also aid in the extraction of new sources of oil and gas, development of alternative energy sources, and advancement in medical sciences.
    • Disaster Management: Supercomputers have also helped weather forecasters to accurately predict severe storms, enable better mitigation planning and warning systems.
    • They are also used by financial services, manufacturing and internet companies and infrastructure systems like water-supply networks, energy grids, and transportation.
    • Future applications of artificial intelligence (AI) also depend on supercomputing.
    • Due to the potential of this technology, countries like the US, China, France, Germany, Japan, and Russia have created national-level supercomputing strategies and are investing substantially in these programmes.

    When did India initiate its efforts to build supercomputers?

    • India’s supercomputer programme initiated in the late 1980s, when the United States ceased the export of a Cray Supercomputer due to technology embargos.
    • This resulted in India setting up C-DAC in 1988, which in 1991, unveiled the prototype of PARAM 800, benchmarked at 5 Gflops. This supercomputer was the second-fastest in the world at that time.
    • Since June 2018, the USA’s Summit is the fastest supercomputer in the world, taking away this position from China.
    • As of January 2018, Pratyush and Mihir are the fastest supercomputers in India with a maximum speed of Peta Flops.

  • Need for guidelines for gene-editing research in India

    The Nobel Prize in Chemistry for 2020 has been awarded for the discovery of CRISPR Cas9. The two scientists have pioneered the use of CRISPR  – Cas9 (CRISPR-associated protein 9) system as a gene-editing tool.

    Background of discovery of CRISPR

    • In 1987a group of Japanese researchers observed an unusual homologous DNA sequence bearing direct repeats with spacing in a eubacterial gene.
    • In subsequent years CRISPR was discovered and showed to be a bacterial adaptive immune system and to act on DNA targets.
    • A notable discovery on the use of CRISPR as a gene-editing tool was by a Lithuanian biochemist, Virginijus Šikšnys, in 2012.
    • Šikšnys showed that Cas9 could cut purified DNA in a test tube, the same discovery for which both Charpentier and Doudna were given the credit.
    • Thus, the exclusion of Siksnys from this year’s Nobel is going to raise discussions.

    Issue of gene-edited babies

    • The world was alarmed by such a mission in 2018 when Chinese scientist edited genes in human embryos using the CRISPR-Cas9 system which resulted in the birth of twin girls.
    • The incident became known as the case of the first gene-edited babies of the world.
    • Following the incident, the World Health Organization formed a panel of gene-editing experts.
    • The expert panel suggested a central registry of all human genome editing research in order to create an open and transparent database of ongoing work.

    Guidelines and regulations in India

    • In India, several rules, guidelines, and policies are notified under the Environment Protection Act, 1986 to regulate genetically modified organisms.
    • The above Act and the National Ethical Guidelines for Biomedical and Health Research involving human participants, 2017, by the Indian Council of Medical Research (ICMR), and the Biomedical and Health Research Regulation Bill implies regulation of the gene-editing process.
    • This is especially so in the usage of its language “modification, deletion or removal of parts of heritable material”.
    • However, there is no explicit mention of the term gene editing.

    Consider the question “What is CRISPR-Cas9? How it helps in the gene-editing? What are the concerns with use of it for gene-editing?”

    Conclusion

    It is time that India came up with a specific law to ban germline editing and put out guidelines for conducting gene-editing research giving rise to modified organisms.

    Back2Basics: What is CRISPR?

    • CRISPRs: “CRISPR” stands for “clusters of regularly interspaced short palindromic repeats.”
    • It is a specialized region of DNA with two distinct characteristics: the presence of nucleotide repeats and spacers.
    • Repeated sequences of nucleotides — the building blocks of DNA — are distributed throughout a CRISPR region.
    • Spacers are bits of DNA that are interspersed among these repeated sequences.
    • In the case of bacteria, the spacers are taken from viruses that previously attacked the organism.
    • They serve as a bank of memories, which enables bacteria to recognize the viruses and fight off future attacks.