🎃 Halloween

Acoustic Levitation: The Floating SkullNew📱2D side-view of the same real standing-wave acoustic trap: a live pressure heat-map and… Acoustic Levitation: The Floating SkullNew📱A real resonant standing acoustic wave between an emitter and reflector traps a small skull… Amber: An Insect Frozen in TimeNew📱2D cross-section simulation of resin polymerizing into amber around a trapped insect, using… Amber: An Insect Frozen in TimeNew📱3D simulation of tree resin trapping an insect and cross-linking into solid amber, with an… Bat Echolocation SonarNew📱A top-down sonar-screen view of the same real echolocation physics — time-of-flight distance… Bat Echolocation SonarNew📱A bat navigates a 3D cave and hunts prey using only pulsed ultrasonic chirps, steering by… Dark Matter Halo Around a GalaxyNew📱A top-down 2D galaxy with a live rotation-curve plot — pan and zoom the disk, click a star,… Dark Matter Halo Around a GalaxyNew📱A 3D galaxy of orbiting stars whose rotation curve stays flat with an adjustable dark-matter… Decomposition: Microbial Succession TimelineNew📱A simplified real 3-guild succession model — a stacked population-over-time chart of aerobic… Decomposition: Microbial Succession TimelineNew📱A live population-dynamics model of real ecological succession — aerobic bacteria, anaerobic… Foxfire: Fungal BioluminescenceNew📱A 2D cross-section of a decaying log where oxygen diffuses in from the bark and mycelium… Foxfire: Fungal BioluminescenceNew📱A 3D branching mycelial network glows in a decaying log, its brightness set by an Arrhenius… Ghost Particle: Neutrino DetectorNew📱A simplified 2D side-view diagram of a neutrino beam crossing a target slab, where the same… Ghost Particle: Neutrino DetectorNew📱A beam of neutrinos streams through a 3D detector tank, almost always passing straight… Haunted Pendulum WaveNew📱Interactive 2D side-view pendulum-wave demonstration — a row of pendulums with slightly… Haunted Pendulum WaveNew📱Interactive 3D pendulum-wave demonstration — a row of pendulums with slightly different real… Jack-o'-Lantern: Light Through Carved WallsNew📱A 2D top-down cross-section of a jack-o'-lantern's wall where dragging on the ring carves it… Jack-o'-Lantern: Light Through Carved WallsNew📱A 3D carved pumpkin shell where candlelight transmission through the flesh follows real… Moonlight Polarization in a Hazy SkyNew📱Flat polar sky map of the real Rayleigh moonlight polarization law, sin²θ/(1+cos²θ), plotted… Moonlight Polarization in a Hazy SkyNew📱Real Rayleigh single-scattering polarization of moonlight mapped across a 3D sky dome… Old House Creaks: Wood Thermal ContractionNew📱A 2D side-view row of floorboards whose anisotropic cross-grain shrinkage builds friction… Old House Creaks: Wood Thermal ContractionNew📱A 3D floor frame where wood contracts far more across its grain than along it as night air… Orb-Weaver Spider Web MechanicsNew📱2D spring-mass simulation of an orb-weaver's radial-and-spiral web, where an insect's impact… Orb-Weaver Spider Web MechanicsNew📱3D spring-network simulation of an orb-weaver's radial-and-spiral web, where an insect's… Orionid Meteor Shower (Peaks in October)New📱A 2D sky-dome view of the October Orionid shower, where meteors streak outward from a… Orionid Meteor Shower (Peaks in October)New📱Earth's rotation carries an observer through the fixed Orionid radiant near Orion while real… Peripheral Motion Detection ReflexNew📱2D pannable/zoomable visual-field map with a motion-sensitivity heatmap, a live… Peripheral Motion Detection ReflexNew📱3D retinal-field model of rod-pooled motion sensitivity rising from fovea to periphery, with… Rusty Iron Gate: Electrochemical CorrosionNew📱A 2D cross-section of an iron bar's corrosion cell — anodic Fe dissolution and cathodic O2… Rusty Iron Gate: Electrochemical CorrosionNew📱A 3D iron gate corrodes as a real galvanic cell — scratch-driven anode sites (Fe to Fe2+)… Shadow Geometry: Umbra and PenumbraNew📱Side-view 2D ray diagram where dragging a shadow-puppet silhouette between an extended lamp… Shadow Geometry: Umbra and PenumbraNew📱An extended lamp sampled across many point sources casts a real umbra and penumbra onto a… Skeleton Biomechanics: Bones as LeversNew📱A simplified side-view lever diagram of a real skeletal joint — pick a first, second or… Skeleton Biomechanics: Bones as LeversNew📱A real articulated skeletal joint — neck, ankle or elbow — modeled as a first, second or… Static Electricity: The Hair-RaiserNew📱Real Coulomb repulsion (F=kQ1Q2/r^2) between charged, bendable hair strands anchored on a… Static Electricity: The Hair-Raiser (2D)New📱Side-view 2D model of the same real Coulomb repulsion (F=kQ1Q2/r^2): each hair strand is a… Tapetum Lucidum: Why Eyes Glow at NightNew📱2D ray-diagram cross-section of a nocturnal eye's tapetum lucidum, tracing light through the… Tapetum Lucidum: Why Eyes Glow at NightNew📱3D ray-traced model of a nocturnal eye's tapetum lucidum, where light reflects off a… The Haunted Door: Hinge Creak ResonanceNew📱2D top-down stick-slip friction model of a door hinge — dry metal-on-metal contact winds up… The Haunted Door: Hinge Creak ResonanceNew📱3D stick-slip friction model of a door hinge — dry metal-on-metal contact winds up and… Triboluminescent Candy GlowNew📱Crush a crystal in 3D cross-section and watch fracture separate charge across the new faces… Triboluminescent Candy Glow (2D Side View)New📱Drag a jaw to compress a candy tablet's sugar-grain mosaic in side view, cracking individual… Venom Diffusion After a BiteNew📱A 2D finite-difference diffusion-clearance model (Fick's law) of venom spreading across a… Venom Diffusion After a BiteNew📱A radially-symmetric 3D diffusion-clearance model (Fick's law) of venom spreading from a… Carrion Beetles: 3D Burial BehaviorNew📱Orbit a full 3D scene of burying beetles (Nicrophorus) sensing decomposition-gas odor,… Carrion Beetles: Nature's DecomposersNew📱Interactive 2D simulation of burying beetles (Nicrophorus) detecting a carcass by… Gravestone Erosion: 3D Surface WeatheringNew📱Orbit a fully three-dimensional gravestone in real time as simulated acid rain dissolves its… Gravestone Erosion: Acid Rain on LimestoneNew📱Interactive 2D simulation of acid rain dissolving a carved limestone or marble gravestone… Will-o'-the-Wisp: 3D Marsh IgnitionNew📱Orbit a full 3D marsh landscape at night and watch pale blue-green wisp flames ignite from… Will-o'-the-Wisp: Marsh Gas IgnitionNew📱Decomposing marsh organic matter releases methane and trace pyrophoric diphosphane, which… Black Hole SpaghettificationNew📱Interactive 2D simulation of tidal spaghettification: drop a jointed chain object toward a… Black Hole Spaghettification: 3DNew📱Free-orbit 3D simulation of black hole spaghettification: watch a chain of masses stretch… Blacklight Fluorescence: 3D Glow RoomNew📱Orbit a dark 3D room and drag a UV lamp around four real fluorescent objects — a scorpion,… Blacklight Fluorescence: What Glows and WhyNew📱Aim a virtual UV blacklight at a scorpion, a tonic-water glass, a mineral rock and… Cordyceps: The Zombie-Ant FungusNew📱Interactive 2D agent-based simulation of Ophiocordyceps unilateralis infecting an ant colony… Cordyceps: Zombie-Ant Fungus — 3D Infection StagesNew📱Full 3D close-up simulation of Ophiocordyceps unilateralis infecting a single ant — scrub… Dry Ice Cauldron: Sublimation FogNew📱Interactive 2D simulation of dry ice sublimation and fog formation — adjust dry ice amount,… Dry Ice Cauldron: Sublimation Fog (3D)New📱Full 3D simulation of dry ice sublimation and cascading fog — orbit the scene and adjust dry… Ectoplasm: 3D Colloidal Light ScatteringNew📱Orbit a fully 3D jar of colloidal 'ectoplasm' fog and reposition a real volumetric light… Ectoplasm: Colloidal Fog in a BottleNew📱Pour a resin-in-alcohol tincture into water and shine a flashlight through the jar to see… Elephant Toothpaste EruptionNew📱Interactive 2D simulation of catalytic hydrogen peroxide decomposition — trigger a foam… Elephant Toothpaste Eruption (3D)New📱Orbit a full 3D volumetric foam eruption from a narrow-necked flask, driven by the real… Fight-or-Flight: 3D Adrenaline CascadeNew📱Interactive 3D circulatory-system model showing adrenaline molecules travel through stylized… Fight-or-Flight: The Adrenaline CascadeNew📱Interactive 2D simulation of the sympathetic fight-or-flight response: trigger a fright and… Infrasound 19 Hz: 3D Standing Wave FieldNew📱Orbit freely through a full 3D room as a 19 Hz infrasound source builds a real… Infrasound: The 19 Hz Fear FrequencyNew📱Watch a low-frequency standing pressure wave build across a room cross-section and see how… Jack-o'-Lantern Candle Flame ChemistryNew📱Simulates a candle's diffusion flame inside a carved pumpkin, rendering the dark… Jack-o'-Lantern Candle Flame: 3D Combustion ZonesNew📱Orbit a full 3D carved jack-o'-lantern lit from within by a real layered candle flame, with… Luminol Chemiluminescence: Molecular View (3D)New📱Full 3D molecular-scale simulation of luminol chemiluminescence — watch individual flash… Luminol: The Crime-Scene GlowNew📱Interactive 2D simulation of luminol chemiluminescence — spray a surface to reveal a hidden… Pareidolia in 3D Terrain: The "Face on Mars" EffectNew📱Full 3D terrain simulation of pareidolia — rotate the light angle over procedurally… Pareidolia: Faces in the StaticNew📱Interactive 2D simulation of visual pareidolia — tune noise and threshold to reveal… Pumpkin Carving Stress: 3D Shell AnalysisNew📱Carve eyes, nose and mouth onto a real curved 3D pumpkin shell and watch a live… Pumpkin Carving: Structural Stress MapNew📱Carve eyes, a nose and a mouth into a 2D pumpkin shell and watch a live stress heatmap show… Scotopic Vision: 3D Retinal Cell MapNew📱An orbitable 3D model of the human retina rendering real rod and cone photoreceptor density… Scotopic Vision: Seeing in Near-DarknessNew📱Interactive 2D simulation of scotopic (rod-dominated) night vision, showing the… The Uncanny Valley: 3D Face MorphNew📱Orbit a real 3D procedural head mesh and drag a human-likeness slider to morph it from… The Uncanny Valley: Human-Likeness CurveNew📱Interactive simulation of Masahiro Mori's uncanny valley: morph a face from cartoon to… Witch's Broom Nebula: 3D Volumetric ShockwaveNew📱Full 3D volumetric simulation of a supernova remnant's filamentary shockwave, modeled on the… Witch's Broom Nebula: Shockwave (2D)New📱Interactive 2D simulation of a supernova remnant's expanding filamentary shockwave, modeled…