Tuesday links

June 30, 1934 was the Night of the Long Knives, Hitler's purge of those standing in his way.

Pee, not chlorine, causes red eyes from swimming pools.

The Frightening Yet Fascinating World Of North Korean Propaganda Videos.

The weirdest thing you'll see all day: this Norwegian potato chip video.

Here are the winners of NOAA's 'Weather in Focus' photo contest.

Funniest Clothing Tags Ever: this is an open list, so you can add your own.

ICYMI, Monday's links are here, and include the battleship built in Union Square (NYC) in 1917, video of a 57-story modular skyscraper being constructed in 19 days, and a gallery of terrifying prehistoric sea monsters.