Kinetic energy an tea. Fun little find via @thedevotea that answers the tea questions you never had:
[bpfb_link url=’http://what-if.xkcd.com/71/’ title=’Stirring Tea’ image=”]Answering your hypothetical questions with physics, every Tuesday.

New: @whatifnumbers, a Twitter feed of numbers I find while answering questions.[/bpfb_link]