🎆 New Year

Antifreeze Proteins: Blocking Ice Crystal GrowthNew📱A 2D cross-section of an ice-water interface pinned locally by adsorbed antifreeze… Antifreeze Proteins: Blocking Ice Crystal GrowthNew📱A 3D ice crystal growth front pinned locally by adsorbed antifreeze glycoprotein molecules… Aurora Borealis: Solar Wind Meets MagnetosphereNew📱A top-down polar-view model of the auroral oval — solar-wind particles precipitate in a ring… Aurora Borealis: Solar Wind Meets MagnetosphereNew📱Solar-wind particles funnel along Earth's dipole magnetic field lines toward the poles,… Avalanche: Snowpack Failure DynamicsNew📱A 2D cross-section of a snow slope where a chain of weak-layer bonds fails one at a time as… Avalanche: Snowpack Failure DynamicsNew📱A layered 3D snowpack on a slope where a grid of weak-layer cells fails in shear cell by… Bird Migration: The Magnetic CompassNew📱2D meridional cross-section of Earth's dipole field with a live radical-pair molecule… Bird Migration: The Magnetic CompassNew📱3D dipole-field model of a migrating bird's cryptochrome-based radical-pair sensor reading… Cesium Atom Clock: Counting OscillationsNew📱A 2D oscilloscope trace and hyperfine energy-level diagram count a cesium atom's… Cesium Atom Clock: Counting OscillationsNew📱A cesium-133 atom's hyperfine transition oscillates in a 3D microwave cavity, counting… Champagne Bubbles: Nucleation Site ChemistryNew📱A 2D side-view champagne flute where bubbles nucleate only at wall-defect sites scored by… Champagne Bubbles: Nucleation Site ChemistryNew📱Bubbles in a 3D champagne flute nucleate only at glass-defect sites scored by classical… Champagne Cork Projectile PhysicsNew📱A 2D side-view companion showing the same Henry's-law pressure launch and ballistic flight… Champagne Cork Projectile PhysicsNew📱Dissolved CO2 pressure under a champagne cork, set by Henry's law and bottle temperature,… Christmas Lights: Series vs Parallel CircuitsNew📱A real 3D string of Christmas light bulbs wired in series or parallel — burn one out and see… Christmas Lights: Series vs Parallel Circuits (2D Schematic)New📱A 2D schematic circuit diagram of a Christmas light string wired in series or parallel —… Circadian Rhythm Reset at MidnightNew📱An interactive 24-hour melatonin curve chart driven by a real light-exposure… Circadian Rhythm Reset at MidnightNew📱A 3D suprachiasmatic-nucleus neuron cluster pulses with clock-gene expression while a light… Comet at Perihelion: Closest ApproachNew📱Top-down 2D comet orbit solving the same Kepler equation as the 3D version, but proving… Comet at Perihelion: Closest ApproachNew📱3D eccentric Keplerian comet orbit where the exact Kepler-equation solution drives genuine… Confetti Fall: Chaotic Flutter DynamicsNew📱A 2D falling flat plate whose angle-of-attack-dependent lift and drag couple to its own… Confetti Fall: Chaotic Flutter DynamicsNew📱Real orientation-coupled flat-plate aerodynamics — click to fire a burst of confetti and… Countercurrent Heat Exchange in Arctic LegsNew📱A 2D along-limb temperature-profile chart of the artery/vein countercurrent heat exchanger… Countercurrent Heat Exchange in Arctic LegsNew📱3D model of the artery/vein rete mirabile in an arctic animal's limb, where warm outbound… Firecracker Chain ReactionNew📱A 2D side-view string of firecrackers linked by a common fuse, each igniting the next after… Firecracker Chain ReactionNew📱A string of firecrackers linked by a common fuse, each igniting the next after a real… Firework Colors: Metal Salt Flame TestNew📱2D Bunsen-burner flame test with a live emission-spectrum band — dip a metal-salt swab into… Firework Colors: Metal Salt Flame TestNew📱Real atomic-emission flame test on a burning firework star in 3D — pick a metal salt (or… Firework Shell Trajectory & BurstNew📱A 2D side-view ballistic model of a firework shell's launch trajectory and radial star burst… Firework Shell Trajectory & BurstNew📱A firework shell follows a real ballistic trajectory with launch velocity, gravity and air… Firework Shockwave: The Sound DelayNew📱A top-down 2D map of a firework's sound wavefront expanding at the real speed of sound while… Firework Shockwave: The Sound DelayNew📱A 3D firework burst where the light flash is essentially instant but the boom rides a real… Frost Patterns on Glass: Fractal GrowthNew📱A simplified 2D diffusion-limited-aggregation model of frost growing from glass-surface… Frost Patterns on Glass: Fractal GrowthNew📱A real diffusion-limited-aggregation crystal-growth model seeded at glass-surface defects,… Gift Wrapping: Minimal Surface & Packing MathNew📱A 2D blueprint of the real minimum-wrapping-paper formula for a box, plus a genuine 2D shelf… Gift Wrapping: Minimal Surface & Packing MathNew📱Derive the real minimum-wrapping-paper formula for a box and watch a genuine extreme-point… Harmonic Countdown: Synchronized PendulumsNew📱Side-view 2D demo of Huygens' coupled clocks — a linearized shared-support model shows… Harmonic Countdown: Synchronized PendulumsNew📱Equal-length pendulums hanging from a shared, spring-mounted support beam gradually lock… Helium Balloon: Buoyancy and Slow DeflationNew📱2D side-view simulation of a helium balloon's Archimedes buoyancy and its gradual loss of… Helium Balloon: Buoyancy and Slow DeflationNew📱3D simulation of a helium balloon's Archimedes buoyancy and its gradual loss of lift as… Hibernation: The Metabolic Rate PlungeNew📱A pannable, zoomable 2D timeline chart of a hibernating mammal's body temperature and… Hibernation: The Metabolic Rate PlungeNew📱A real Q10-driven model of a hibernating mammal cycling between deep torpor and costly… Ice Skating: Pressure Melting ExplainedNew📱A 2D side-view cross-section of a skate blade on ice, comparing the tiny Clausius-Clapeyron… Ice Skating: Pressure Melting ExplainedNew📱A skate blade slides on ice while the sim honestly compares Clausius-Clapeyron… Kepler's Third Law: Orbital Resonance CountdownNew📱A top-down 2D view of Kepler-law orbital resonance with a live relative-angle phase dial and… Kepler's Third Law: Orbital Resonance CountdownNew📱Two or three orbiting bodies with radii set by Kepler's third law lock into an integer-ratio… Midnight Crowd: Pedestrian Wave DynamicsNew📱A top-down social-force-model crowd walks a closed New Year's Eve avenue in both directions,… Midnight Crowd: Pedestrian Wave DynamicsNew📱A social-force-model crowd circles a New Year countdown tower in 3D, spontaneously forming… Midnight Wave: New Year Crossing TimezonesNew📱A pannable flat map plus an independent linear timeline plot the same real 26-hour New… Midnight Wave: New Year Crossing TimezonesNew📱A rotating 3D Earth sweeps the real 26-hour New Year's midnight wave across 34 real named… New Year Spiral: The Golden Ratio in TimeNew📱A real logarithmic spiral r = a·e^(bθ) plotted in 2D with pan/zoom, next to a live… New Year Spiral: The Golden Ratio in TimeNew📱A real logarithmic spiral r = a·e^(bθ) rendered as a rising 3D helix (one turn per year)… Ornament Pendulum Chaos on the TreeNew📱A side-view real double pendulum — an ornament hinged below an ornament — driven by the full… Ornament Pendulum Chaos on the TreeNew📱A real double pendulum — one ornament hanging from another on a tree branch — solved with… Penguin Huddle: Collective ThermoregulationNew📱A simplified top-down 2D model where each penguin's exposed-edge fraction (not touching a… Penguin Huddle: Collective ThermoregulationNew📱Each penguin's own exposed-perimeter geometry sets its individual heat-loss rate in a 3D… Planetary Alignment: A Rare ConjunctionNew📱Top-down 2D orrery of the eight planets orbiting the Sun at their real Kepler-law relative… Planetary Alignment: A Rare ConjunctionNew📱3D real-orbital-mechanics model of the eight planets circling the Sun at their true… Polar Bear Fur: Hollow Hairs as Light GuidesNew📱2D ray-diagram cross-section of a hollow, transparent polar-bear guard hair guiding light to… Polar Bear Fur: Hollow Hairs as Light Guides (3D)New📱3D total-internal-reflection ray tracer through a hollow, transparent polar-bear guard hair,… Rock Candy: Sugar Crystal GrowthNew📱A simplified 2D growth-interface model of the same real sucrose crystallization: independent… Rock Candy: Sugar Crystal GrowthNew📱A supersaturated sucrose solution deposits sugar onto a seed crystal in real 3D —… Satellite Reentry: The Fireball DescentNew📱2D side-view satellite reentry trajectory paired with a live Sutton-Graves heating-rate… Satellite Reentry: The Fireball DescentNew📱3D deorbiting-satellite reentry driven by real Sutton-Graves compression heating (not air… Snow Globe Fluid DynamicsNew📱A 2D vertical cross-section of a snow globe's viscous fluid, where a shaken-in Lamb-Oseen… Snow Globe Fluid DynamicsNew📱Shaking a 3D snow globe injects a real viscous Lamb-Oseen vortex field that decays over… Snowflake Dendritic GrowthNew📱A simplified 2D hexagonal-lattice diffusion automaton grows an ice crystal whose fill… Snowflake Dendritic GrowthNew📱A 3D diffusion-limited cellular automaton grows an ice crystal on a hexagonal lattice,… Sparkler Combustion: Metal Particle SparksNew📱A 2D side-view of a burning sparkler's metal-powder particles, each following independent… Sparkler Combustion: Metal Particle SparksNew📱A burning sparkler tip ejects real metal-powder combustion particles whose ballistic… Spinning Top Precession: Why It Doesn't FallNew📱A simplified 2D side-view model uses the quasi-steady precession law Ω = τ/(Iω) driven by a… Spinning Top Precession: Why It Doesn't FallNew📱A real rigid-body spinning top precesses under gravity's torque via full nutating Lagrangian… Supercooled Water: Instant FreezeNew📱Chill pure water below 0°C in a 2D flask cross-section without it freezing, then tap to… Supercooled Water: Instant FreezeNew📱Chill pure water below 0°C in 3D without it freezing, then click to trigger a real… The Clink: Acoustic Resonance of a Toast GlassNew📱A 2D cross-section and top-down mode-shape view of the same real thin-shell glass resonance… The Clink: Acoustic Resonance of a Toast GlassNew📱A toast glass's wall thickness, radius, height and material set its natural resonant… Times Square Ball Drop: Descent MechanicsNew📱A side-view motor-and-cable winch lowers the ball down a fixed pole under proportional… Times Square Ball Drop: Descent MechanicsNew📱A motor-driven cable and pulley lower the ball down a fixed pole under proportional feedback… Timezones: Earth's Rotation VisualizedNew📱A flat equirectangular map whose day/night terminator is computed per pixel from the real… Timezones: Earth's Rotation VisualizedNew📱A real Earth globe rotating at the true 15°-per-hour rate under a fixed sun light, casting a… Why Leap Years Exist: Orbital RemainderNew📱2D top-down orbit plus a live calendar-drift chart plotting seasonal drift (days) against… Why Leap Years Exist: Orbital RemainderNew📱3D Earth orbiting the Sun at the real 365.2422-day period while a switchable calendar (none… Why a Year Is 365 Days: Earth's OrbitNew📱Top-down 2D Kepler-orbit simulator where dragging the orbital-radius or star-mass sliders… Why a Year Is 365 Days: Earth's OrbitNew📱3D Kepler-orbit simulator where changing orbital radius or central star mass recomputes the…