The Week In Numbers: The Periodic Table Gets An Update, Curiosity Finds Lots Of Martian Water, And More

2 percent: the portion of Martian soil that was water in a recent analysis from the rover Curiosity

4: the number of aluminum mirrors in these telescopic contacts lenses

66: the number of radio dishes in the most ambitious ground telescope ever built

1969: the year scientists first used the word "flashback" to describe a reoccurrence of an LSD-like state (are acid flashbacks a myth?)

100 microns: the length of the magnetic nano-cages that could some day carry drugs into your brain or eyes

$449: the price of the new Microsoft Surface 2 tablet

19: the number of elements that got new official atomic weights this week, thanks to improved measurements