"Where House Cats Roam"
Jeff A. Horn and colleagues tracked the wanderings of house cats and feral cats in "Home range, habitat use, and activity patterns of free-roaming domestic cats." They published their results in July in The Journal of Wildlife Management.
Liquid nitrogen drops bounce along under a veil of gas in a YouTube video by W. Wayt Gibbs and Nathan Myhrvold.
"'Cooking' with Cold: Liquid Nitrogen and Dry Ice" by Jeff Potter offers safety advice and a recipe for making ice cream with liquid nitrogen.