Not all viruses are bad for us. Some of them might even help up us fight off bacterial infections someday.
Naturally occurring viruses called bacteriophages attack specific types of bacteria. So researchers at the University of Leicester decided to try and take advantage of phages' bacteria-destroying powers to treat infections with Clostridium difficile, a germ that that can cause severe diarrhea and inflammation of the gastrointestinal tract.
It's been a tough week for the Tea Party and its supporters in Congress. The Affordable Care Act survived the Capitol Hill standoff largely untouched. President Obama and the Democrats stared them down and won. And fights with establishment Republicans revealed the depth of division within the GOP.
Thugs with machetes killed Muhammed's two younger brothers. They were coming for him next.
Lingering violence from an 11-year civil war sent Muhammed fleeing his village in Sierra Leone. He escaped to the coast and paid smugglers to sneak him into the cargo hold of a ship at port. He had no idea where he was going.
"There was no light, no food â€” nothing for 10 days," he recalls. "I was very hopeless. I'd been in the darkness for 10 days."