The numbers for July 31, 2013: 1s and 50s

50

The percent of 18-24-year-old TV and computer users that look at Facebook during primetime hours, 8 p.m. to 11 p.m. (Bloomberg)

1st

According to astrophysicist Jason Steffen at the University of Illinois, the best order to board an airplane is to fill the window seats first. (PopSci)

150

As in Ford’s F-150 will now be available to run on compressed natural gas. (USA Today)