"Ice-nine is a material appearing in Kurt Vonnegut's novel Cat's Cradle. Ice-nine is supposedly a polymorph of water (invented by Dr. Felix Hoenikker), more stable than common ice (Ice Ih); instead of melting at 0 \u00B0C (32 \u00B0F), it melts at 45.8 \u00B0C (114.4 \u00B0F). When ice-nine comes into contact with liquid water below 45.8 \u00B0C (thus effectively becoming supercooled), it acts as a seed crystal and causes the solidification of the entire body of water, which quickly crystallizes as more ice-nine."@en .