Kilogram losing weight
(via Eric Stone)

Remember the definitions of the fundamental units of measurement from your school days? Well, it is now time for some unlearning. The platinum-iridium cylinder that was the reference for how much a kilogram weighs has been apparently losing weight; in the last 100 odd years has lost 50 micrograms (with reference to what, I don't know). Scientists are on the lookout for a more stable, less-weight conscious reference.