the.com/ice
water's chill alter ego, lighter than its liquid self and stubbornly slow to melt
expandsFrozen water grows about 9% bigger, cracking pipes
floats weirdlyRare solid that floats on its own liquid
ancient layersAntarctic ice holds air bubbles million years old
crystal shapesForms hexagonal lattices, hence six-sided snowflakes
slippery mysteryWhy it's slick still puzzles physicists today