4. Luckily for the world, a 3D printer can cost as much as $10,000, so this won’t exactly put a gun in the hand of anyone who wants one. But it is an impressive technological feat.
5. Check out footage of it being fired below.
- Justice Antonin Scalia, the conservative heart of the U.S. Supreme Court for more than a decade, has died at 79. He was the current court's longest-serving justice.
- U.S. Republican presidential candidates will debate tonight at 9 p.m. ET on CBS for the first time since Donald Trump's win in New Hampshire.
- Bitterly cold temperatures and arctic winds began freezing large swathes of the U.S. Northeast on Saturday.