Science & Physics — Posts

77 posts on "Science & Physics" by Shlomo Strauss — bilingual writing on technology, science, and business.

• Earthquake Lights, Mie Scattering and Venezuela's Red Sky — While dust caused Venezuela's red skies via Mie scattering, true earthquake lights stem from tectonic pressure and may help predict future tremors.
• Propeller Physics: From Mars Drones to Quiet Laptops — How atmospheric density and the speed of sound shape propeller design, from NASA's Mars drones to the silent cooling fans in laptop computers.
• How Quantum Tunneling Powers the Race for Nuclear Fusion — Driven by quantum tunneling and billions in investments, researchers are racing to achieve net energy gain from commercial nuclear fusion.
• How the Global Helium Crisis Threatens Advanced Technology — An Iranian attack on Qatari facilities and the depletion of US reserves have triggered a severe helium shortage, threatening chipmaking and MRI systems.
• The Science Behind Why a $4,000 Audio Cable Sounds Like a $7 One — Tests reveal that expensive RCA cables offer no audio improvement over cheap ones, a phenomenon explained by simple physics and confirmation bias.
• Antimatter transported for the first time in human history — A look at how CERN researchers transported antimatter in a purpose-built container, the physics behind its staggering cost, and its potential use in…
• The physics of bungee cords, and why summer jumps feel better — From vulcanized natural rubber to the Gough-Joule effect, this piece explains the material science that makes a modern bungee cord safe — and why cold…
• From banana leaves to the lab: the science behind chocolate — A breakdown of the fermentation process that turns raw cacao into chocolate, alongside the lab-grown cacao technology that could reshape the global…
• One cashew tree that spans the area of 70 — the genetic secret behind — A record-holding cashew tree in Brazil owes its grove-sized spread to two rare genetic mutations that cause its branches to root upon touching the ground.
• Gallium: the metal that melts in your hand and corrodes aircraft — A concise look at gallium's unusual properties, its role in power electronics and military radar, the complexity of refining it, and why China's dominance
• How salt kills living cells, and the statistics behind osmosis — A concise explanation of osmosis, why high salt concentration outside a cell causes its death, and how certain organisms survive in extreme saline…
• Extremophiles: life forms that thrive where others cannot survive — From cold-adapted enzymes in laundry detergents to heat-loving microbes in a Gobi Desert hot spring, this piece explores how extremophiles work and why…
• Why skin darkens in the sun, and what an orange shark has to do with — A clear look at how melanin and carotenoids protect living cells from UV radiation, illustrated by a rare shark observed off Costa Rica with both albinism
• Methane: from swamp gas to Saturn's moon and a crater that won't stop — A concise explainer on methane covering its biological origins, its role shaping Titan's landscape, and the Darvaza crater that has burned since 1971.
• Iodine: from table salt to spacecraft propellant — A weekly science digest covering iodine's role in the body, its energetic reaction with titanium, and its potential as a spacecraft propellant.
• How Android phones became a global earthquake detection network — Google's Android earthquake system used phone accelerometers to detect over 11,000 quakes between 2021 and 2024, sending warnings up to 60 seconds before…
• Laminar flow and the Reynolds number: the physics behind a tap that — A look at laminar versus turbulent flow, the dimensionless Reynolds number that marks the boundary between them, and why it matters in pipelines, blood…
• Ammonium nitrate: why the same compound fertilizes crops and levels — A concise chemical explanation of why ammonium nitrate is both a highly effective fertilizer and the powerful explosive behind disasters like the 2020…
• Why a glowing copper ball barely scorches a coconut shell — Lignin in the coconut shell undergoes endothermic pyrolysis, absorbing heat and forming an insulating char layer — a property that also makes lignin…
• Carbon: the element that makes life possible and threatens it — From DNA to fossil fuels and carbon monoxide poisoning, a concise look at the chemistry that makes carbon both essential to life and a source of serious…
• How FPSO platforms use hydrostatics and electrostatics to process oil — A look at how FPSO vessels exploit hydrostatic pressure, gravity separation, and electrostatic fields to extract, process, and store crude oil far…
• Bioluminescence: from glowing cave larvae to self-lit street trees — The luciferase-luciferin reaction behind New Zealand's glowing cave worms also points toward engineered luminescent trees as a future alternative to…
• Why your jeans are yellow before they turn blue — the chemistry of — A concise look at indigo's history and chemistry — from death penalties for smuggling it to a Nobel-winning synthesis and the redox reaction behind every…
• The children's uranium kit from the 1950s that became one of — The Gilbert U-238 Atomic Energy Lab sold radioactive ore samples and a Geiger counter to children in the early 1950s, with fewer than 5,000 units made…
• The physics of glass: why it shatters and how it is made stronger — From borosilicate to tempered glass, the post explains the physical mechanisms behind heat resistance and impact strength in different types of glass.
• Why ice crystals in cirrus clouds create rings of light around the — A clear explanation of how hexagonal ice crystals in cirrus clouds refract sunlight at precise angles to produce single or double halos around the sun.
• The ring-wing aircraft and the physics of wingless edges — Wingtip vortices waste up to 40% of an aircraft's energy, and Lockheed's ring-wing concept offers a structural solution rooted in basic physics.
• The 660-ton pendulum keeping Taipei 101 standing — The 660-ton steel sphere suspended inside Taipei 101 uses inertia and energy conservation to counteract earthquakes and typhoons — the same damping…
• How levitation works — and why it matters for climate and quantum — From Meissner-effect superconductors to optical tweezers and the Casimir force, this piece explains how levitation works and what room-temperature…
• Adiabatic compression: how squeezing air starts fires and shapes the — From diesel engines to alpine winds and collapsing stars, this piece explains how the ideal gas law links volume, pressure, and temperature in surprising…
• Cherenkov radiation: when particles outrun light in water — A clear explanation of why nuclear reactor cores glow blue, and how the same physics underlies ship wakes and sonic booms.
• Soap bubbles, surface tension and Plateau's laws: the physics of — From the Laplace equation to Plateau's 120-degree rule, this post explains how surface tension and energy minimization shape soap bubbles, honeycombs, and
• The physics of suspension bridges: resonance, triangles, and spider — A look at the structural principles behind suspension bridges — cable geometry, resonance failure, and the triangulation shared by bike frames and bird…
• The neutrino that nearly broke the speed of light barrier — From a $100-million underground detector in Japan to a loose cable that sent physics into a panic, this piece traces the neutrino's strangest moments.
• Sound weapons in Serbia: the wave physics behind a crowd's sudden — An explanation of how phased speaker arrays use constructive interference to produce dangerously intense sound, illustrated by reported use against…
• Cesium: the metal behind atomic clocks and nuclear fallout — From defining the international second to persisting in post-nuclear fallout, this post examines the remarkable atomic properties that make cesium both…
• Why penguins waddle, and what it has to do with pendulums — A penguin's distinctive waddle adds a lateral pendulum dimension to its gait, enabling up to 20% greater energy efficiency compared to human walking.
• Why a pickle glows yellow when electric current passes through it — Sodium ions in a pickle emit light at 589 nm when excited by electric current — the same principle behind old sodium street lamps.
• Why electronic solder is exactly 63% tin and 37% lead — The specific tin-lead ratio in solder is no accident — it forms a eutectic mixture that lowers the melting point to 183°C, protecting circuit boards…
• The physics of tornadoes: vortices, water vapor, and traffic lanes — A clear explanation of how vortices form, what turns them into tornadoes, and why the inner lane of a roundabout gets you around faster.
• The structural secret that makes teeth nearly unbreakable — Tooth enamel's hexagonal hydroxyapatite rods and flexible amelogenin protein combine to withstand hundreds of kilograms of pressure while resisting sudden
• Why ping-pong balls explode out of a container when doused with — Liquid nitrogen at minus 196°C vaporizes on contact with ping-pong balls and expands 700-fold in volume, launching the balls in every direction.
• How water at 60,000 PSI cuts through steel like butter — Using Pascal's and Bernoulli's laws together, a thin water jet reaches 2.5 times the speed of sound — enough to slice through steel with remarkable…
• Neodymium: the element behind color-shifting glass and electric — The electron structure of neodymium causes glass to shift color under different light sources — and the same element puts over a kilogram of rare-earth…
• Fool's gold and its surprising potential in clean energy — Pyrite, long dismissed as fool's gold, is a natural semiconductor that researchers are investigating for use in solar cells and high-capacity lithium…
• The physics behind fireworks colors — From metal salt combustion to electron energy transitions, this post explains how fireworks get their colors, shapes, and precise timing.
• Supercooled water and the physics of instant freezing — A clear explanation of supercooling — why pure water stays liquid below 0°C, how a gentle squeeze triggers chain-reaction freezing, and the link to…
• The triple point: where water boils and freezes at once — An explanation of water's triple point — the precise temperature and pressure at which all three phases coexist — and what it has to do with pressure…
• Melting metal without touching it: induction heating explained — A changing magnetic field from an AC coil levitates a metal piece and heats it from within via eddy currents until it melts — the same principle behind…
• The vapor cloud behind a supersonic jet: Prandtl-Glauert and — Flight near Mach 1 produces two unrelated phenomena — a sonic boom and a condensation cloud — and this post explains the physics behind each.
• Sodium polyacrylate: the polymer that absorbs 800 times its volume in — A clear breakdown of how sodium polyacrylate's ionic polymer chains attract water molecules, why salt reduces that capacity, and the role osmosis plays in
• The Rehbinder Effect: how water makes glass resist shattering — Discovered in 1928, the Rehbinder effect explains how surface-active substances weaken intermolecular bonds in solids, making materials like glass…
• How pure oxygen can make a diamond vanish — When a diamond is heated to extreme temperatures and exposed to pure oxygen, every carbon atom oxidizes into CO₂, dissolving the hardest natural material…
• Why titanium screws change color: the physics of electrochemical — A titanium dioxide layer formed by electrochemical redox produces a spectrum of colors through light interference, not changes in chemical composition.
• What a video player looked like in 1930 — Decades before digital pixels, early video devices already relied on the same core principle: cycling still images fast enough to fool the human eye into…
• The physics of what happens when lightning strikes a tree — A lightning bolt carrying billions of watts superheats water inside a tree until it explodes, and the post explains how lightning forms and travels from…
• Vantablack: the material that absorbs 99.965% of visible light — A concise look at how carbon nanotubes make Vantablack so extraordinarily dark, its uses in telescopes and space, and the art-world controversy it sparked.
• Why batteries explode under pressure — A step-by-step look at battery anatomy and the chain reaction that turns physical pressure into fire and heat.
• Why a flame conducts electricity: fire as plasma — A flame placed between charged metal plates acts as an electrical conductor because fire is a plasma full of free electrons and positive ions.
• The Dzhanibekov Effect: Why Objects Flip in Zero Gravity — A phenomenon discovered accidentally in space in 1985 explains why a rotating object periodically flips 180 degrees when spinning on its intermediate axis.
• Van de Graaff generator: how a spinning belt builds millions of volts — A clear breakdown of how a Van de Graaff generator accumulates extreme voltage, and why high voltage alone does not determine the danger of electric shock.
• Dendritic agate and the fractal geometry hiding in minerals — Dendritic agate is a manganese and iron oxide crystal whose repeating fractal growth process produces plant-like patterns resembling both snowflakes and…
• Prince Rupert's Drops: the physics of a nearly indestructible head — The internal stress locked inside Prince Rupert's Drops explains both their remarkable resistance to crushing and their explosive fragmentation when the…
• Why modern recording studios use glass walls instead of foam panels — Double-pane vacuum glass and angled inner panels deliver effective acoustic isolation in small studios while preventing claustrophobia and preserving…
• The cloud chamber: tracing radioactive particles through — A clear breakdown of how Wilson's cloud chamber uses supercooled vapor and ionization to make radioactive particle tracks visible and measurable.
• The Meissner effect: how superconductors make magnets levitate — Superconductors eliminate electrical resistance and expel magnetic fields entirely, a phenomenon Walter Meissner described in 1933 that causes magnets to…
• The Leidenfrost effect: when liquid hovers above a hot surface — A thin vapor layer can prevent liquid from ever touching a superheated surface, with real consequences for nuclear cooling and advanced materials research.
• How a tiny quartz crystal keeps your watch accurate — From piezoelectricity to the Mohs scale, this piece explains the engineering behind the 32,768 Hz quartz crystal at the heart of every modern watch.
• What happens when magnesium meets microwave radiation — A piece of magnesium in a quartz cup turns into glowing plasma inside a microwave — here is the physics behind the blue sparks.
• Why geysers erupt: atmospheric pressure and the boiling point — A concise physics explainer on how atmospheric pressure determines water's boiling point, and how that same principle drives the cyclic eruption of…
• Why a spinning apple hovers and then explodes: two physics principles — A levitating apple that suddenly bursts apart demonstrates how the Coandă effect spins an object to the point where centrifugal force tears it to pieces.
• Why the bottom of a frozen lake stays at exactly 4 degrees Celsius — Water's maximum density at 4°C drives the layered freezing and thawing cycle of lakes, keeping the bottom at that precise temperature all winter.
• Why explosives explode: the chemistry behind the blast — A concise explainer on exothermic and endothermic reactions, and why explosives are defined not by energy density but by the speed of their release.
• Mono, stereo, binaural and Atmos: a quick guide to audio formats — A concise breakdown of the main audio formats, from mono to object-based sound, and how each one attempts to recreate spatial hearing.
• The Stirling Engine and Three Forms of Energy in One Flame — A Stirling engine powered by a candle illustrates the chain from chemical to thermal to kinetic energy, and why that energy cannot be reused.
• Why a firework keeps burning underwater — A built-in oxidizer supplies oxygen independent of the surroundings, and combustion temperatures above 1,000 °C evaporate water faster than it can cool…
• Shape memory alloys: how metal remembers its original form — Alloys like nickel-titanium switch between austenite and martensite phases, allowing them to recover their original shape when heated.