700 miles: the diameter of Dione, an icy moon of Saturn that may be home to a subterranean ocean—and “astrobiological potential”
13 million light-years: the distance from Earth to this perplexing black hole, which appears to have recently gone quiet at the center of the Sculptor galaxy
1975: the year Lego added human figures to its toy sets. Since then, the figures have featured increasingly angry facial expressions, according to a new study
75: the average number of Lego bricks for every person on Earth
95 percent: the portion of people who fail to wash their hands properly after using a public restroom, a new bathroom-spying study has found
70,000 metric tons: the amount of commercial spent fuel stored in U.S. nuclear reactors. A start-up called Transatomic Power says it has designed a reactor that could use this fuel stockpile to power the U.S. for 70 years.
15 microns: the thickness of a newly discovered human body part (can you guess where it is?)
$399: the price of the just-announced PlayStation 4, which will feature streaming gaming, new titles, and no restrictions on on used games
30,000: the population of Songdo, South Korea, one of the world’s most successful eco-cities. A pneumatic waste-collection system transports garbage by tube instead of by truck, and Songdo’s parking garages come with charging stations for electric cars.
40 percent: the portion of Americans between the ages of 18 and 29 that have at least one tattoo. Ever wonder what makes tattoos permanent?