An amusing tidbit, from HuffPo:
The U.S. population has reached a nerdy and delightful milestone.
Shortly after 2:29 p.m. on Tuesday, August 14, 2012, the U.S. population was exactly 314,159,265, or pi (π) times 100 million, the U.S. Census Bureau reports. The U.S. Census Bureau's Population Clock projects the real-time size of the U.S. population based on monthly population estimates.
Alright that's pretty cool. I'm going to have to tell my math teacher that...