✓ Two crowns ✓ Same mass, different density ✓ Vertical slider ✓ Slider works ✓ Slider controls crowns ✓ Slider direction correct ✓ Full slider range ✓ Fall animation ✓ Water displacement ✓ Rising water level ✓ Splash effects ✓ Physics correct ✓ Live mass value ✓ Live volume value ✓ Live density value ✓ Live displaced water ✓ Gilded displaces more ✓ Heureka animation ✓ No external deps ✓ Light bg / dark text ✓ Self-contained HTML
Exceptionally complete implementation with correct physics (MASS=1000g, ρ_gold=19.3, ρ_fake=8.5), live data panels, splash particles, rising water, force arrows, comparison bar, and a polished Heureka modal — minor flaw is the water-rise visual scaling uses an arbitrary ×18 factor rather than true pixel-per-cm calibration, making the rise somewhat exaggerated.
Exceptionally complete implementation with correct physics (MASS=1000g, ρ_gold=19.3, ρ_fake=8.5), live data panels, splash particles, rising water, force arrows, comparison bar, and a polished Heureka modal — minor flaw is the water-rise visual scaling uses an arbitrary ×18 factor rather than true pixel-per-cm calibration, making the rise somewhat exaggerated.