Struggling with tricky and important concepts in UPSC Prelims? The exam increasingly tests your conceptual clarity and ability to apply core ideas, especially in the most dynamic subjects: Science, Economy, and Environment (SEE).UPSC Essentials’ new initiative, UPSC Prelims ‘SEE’ Snapshot, brings you, every Wednesday, a quick, exam-focused revision of key concepts. In each article, we pick three important current themes from Science, Economy, and Environment and decode them strictly through the Prelims lens—focusing on concepts and clarity. Previously, we have covered concepts such as induction cooktops, tar balls, forex reserves, Nor’westers, Earth’s energy imbalance, and GDP rebasing, etc. SCIENCEVitalID Core Concept: — VitalID technology uses the vibrations generated by our breathing and heartbeats. These subtle movements travel through the neck and into our skulls. Because every person’s bone structure and tissue are slightly different, these patterns are unique— much like fingerprints.— The system was introduced at the 2025 ACM Conference on Computer and Communications Security and is designed primarily for extended reality environments. According to researchers, it does not require any additional hardware. Instead, it relies on motion sensors already built into many modern headsets. (Image: AI-generated)— Extended reality: Abbreviated as XR, Extended reality comprises virtual reality, augmented reality, and mixed reality technologies. XR technologies combine the physical world with digital elements. XR technologies are mostly used in gaming platforms such as Viture, Meta Quest, and Oculus Rift. However, the use of XR technologies has been increasing.UPSC Twist Points– VitalID vs Biometric Story continues below this ad— Biometrics: It refers to technology that identifies individuals using unique physical characteristics such as fingerprints, facial features, iris patterns, or voice. Biometric authentication is widely used for device unlocking, banking, and secure access systems, offering higher security and convenience compared to traditional password-based methods.— Whereas VitalID uses internal physiological signals (heartbeat and breathing vibrations through the skull), captured via motion sensors, making it passive, continuous, and harder to spoof, Biometric Authentication relies on physical or behavioral traits (such as fingerprint, face, iris, or voice), which may involve active or passive scanning and are widely used. 5 Questions · Authentication Technology · UPSC Relevance Q 1 of 5What does VitalID use to authenticate users?Fingerprints and iris patternsVibrations from heartbeat and breathing through the skullFacial muscle movements captured by a cameraVitalID uses subtle vibrations generated by breathing and heartbeats that travel through the neck and skull. Since every person's bone structure and tissue differ slightly, these patterns are unique — much like fingerprints.Next →Q 2 of 5Where was VitalID first publicly introduced?World Economic Forum, Davos 2025CES 2025, Las VegasACM Conference on Computer and Communications Security, 2025Researchers introduced VitalID at the 2025 ACM Conference on Computer and Communications Security, where it was designed specifically for extended reality environments.Next →Q 3 of 5What additional hardware does VitalID require to function?A dedicated biometric chip embedded in the headsetAn external breathing sensor clipped to the userNone — it uses motion sensors already built into modern headsetsVitalID requires no additional hardware. It relies entirely on motion sensors already present in many modern XR headsets, making deployment simpler and more cost-effective.Next →Q 4 of 5What does XR stand for in the context of this technology?Extreme ResolutionExtended RealityExperimental RenderingXR stands for Extended Reality — an umbrella term comprising virtual reality (VR), augmented reality (AR), and mixed reality (MR). XR technologies combine physical and digital elements and are used in platforms like Meta Quest and Oculus Rift.Next →Q 5 of 5What is a key advantage of VitalID over conventional biometric authentication?It uses external physical traits that are easier to scanIt requires active user participation for every loginIt captures internal physiological signals passively, making it harder to spoofVitalID uses internal signals — heartbeat and breathing vibrations — captured passively and continuously. Unlike fingerprints or facial features, these internal signals are significantly harder to replicate or spoof.See My Score →Express InfoGenIE ECONOMYNon-deliverable derivative (NDD) Core Concept:— Before knowing about the NDD, let’s first understand what derivatives are. ‘Derivatives’ refers to the financial instruments that derive their value from an underlying security or financial instrument. The underlying products can be equities, commodities, currencies, etc. Derivatives are primarily used by investors for hedging their position and minimizing the price risk.Story continues below this ad (Image: AI-generated)— NDDs, which are typically traded outside India in financial hubs like Singapore, Hong Kong, London or Dubai, allow participants to bet on the rupee’s direction without actual delivery of the currency.— An NDD is a derivative contract where two parties agree on a future exchange rate for the rupee, but settle the difference in cash, usually in US dollars.— The NDD market is widely used by foreign investors, hedge funds and global banks who cannot freely access and play in the Indian rupee market, as well as by firms looking to hedge currency risk. These trades take place offshore, outside the control of the RBI.UPSC Twist Points– Futures, Options and Swaps— The common derivatives are Futures, Options and Swaps.Story continues below this ad— A Futures Contract is an agreement to make or take delivery of a specified quantity at an agreed price on a future date in the underlying market. Futures contracts exist in commodities, equities, equity indices, interest rates and currencies. — An Option is a right but not an obligation to make or take delivery of a specified quantity of an underlying asset at an agreed price on a future date. Option contracts also exist, just like future contracts, on different underlying assets or rates such as equities, currencies and interest rates etc. — A Swap contract represents an exchange of two streams of payments between two parties. ENVIRONMENTGalactic cosmic raysCore Concept:Story continues below this ad— Despite the name, cosmic rays aren’t rays at all. They’re particles: mostly protons, but also helium nuclei, electrons, and occasionally heavier atomic nuclei stripped bare of their electrons.— They travel through interstellar space carrying enormous amounts of energy packed into something far smaller than an atom. When they slam into Earth’s atmosphere, they trigger cascades of secondary particles that shower down to the surface like invisible confetti. Roughly one cosmic ray particle passes through the palm of your hand every second.— Where do cosmic rays come from? For the lower-energy variety, scientists believe the main culprits are supernova remnants, the glowing, expanding debris clouds left behind when massive stars explode. Within these turbulent remnants, magnetic fields accelerate charged particles like a cosmic game of pinball, each bounce adding more energy. (Image: AI-generated)— Because cosmic rays are charged particles, they don’t travel in straight lines. Magnetic fields – both inside our galaxy and beyond – bend their paths, scrambling their directions over the vast distances they travel.Story continues below this adUPSC Twist Points– Solar cosmic rays and Cosmic ray shower — Solar cosmic rays (cosmic rays from the sun) originate in the sun’s chromosphere. Most solar cosmic ray events correlate relatively well with solar flares.— According to the National Oceanic and Atmospheric Administration, scientists have postulated that cosmic rays can affect the earth by causing changes in weather. Cosmic rays can cause clouds to form in the upper atmosphere, after the particles collide with other atmospheric particles in our troposphere.— The process of a cosmic ray particle colliding with particles in our atmosphere and disintegrating into smaller pions, muons, and the like, is called a cosmic ray shower. These particles can be measured on the Earth’s surface by neutron monitors.Story continues below this adPrelims Practice MCQLet’s see how much can you recallConsider the following statements:1. VitalID authentication relies on internal physiological signals.2. Non-deliverable derivative is a derivative contract where two parties agree on a future exchange rate for a currency.3. Galactic cosmic rays consist mainly of high-energy charged particles that can produce secondary particle showers in Earth’s atmosphere.How many of the statements given above are correct?(a) Only one(b) Only two(c) All three(d) NoneAnswer key (c)UPSC Prelims ‘SEE’ Snapshot: Talking cars, GDP rebasing and Nor’westers — quick look Gear up for UPSC Prelims 2026—Practice smarter, revise faster, and succeed with our Special Quiz Magazine. Click Here Click Here to read the UPSC Essentials magazine for April 2026. 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