Ice Spikes Explained

Why do spikes form on ice cubes? Without them the world would be vastly different. Awesome Jingle by Accent: Thanks to Prof. Stephen Morris from UofT: Filmed in part by Martin Marek in Olomouc, Czech Republic Time lapse of a growing ice spike by Lesley Hill, Russ Sampson and Edward Lozowski, with technical help by Kenny Lozowski. Ice spike image by Dan and Lynn Wolaver: Concerned ice spike video by rocknut420: Earth footage courtesy of NASA: Ice vase image by PgunnG: Second ice vase image by A K Haart: