1. On Wednesday, President Obama asked everyone to start Tweeting photos of their personal injuries.
2. The initial reaction was mixed:
5. But then people actually started tweeting their injuries.
26. Some politicians joined in, but they have comms teams that vet campaigns like this.
- U.S. Republican presidential candidates will debate Saturday at 9 p.m. ET on CBS for the first time since Donald Trump's win in New Hampshire.
- Up to 150,000 penguins may have been killed by an iceberg blocking their access to the sea.
- And how well do you know what happened in the news this week? Take our quiz.