Five Best Ideas of the Day March 27
1. Why did Saudi Arabia lead airstrikes on the rebels who've seized Yemen? The answer isn't as clear as it seems. By Frederic Wehrey at the Carnegie Endowment for International Peace, 2. Three black swimmers swept the 100-yard freestyle at the NCAA swim championships  and swept away a long-standing stereotype. By Kavitha Davidson in Bloomberg View, 3. Could a Facebook deal to host news content make news brands obsolete?, By Felix Salmon in Fusion, 4. A new satellite study reveals the rapid breakdown of Antarctic ice. Low-lying nations should be worried. By Robert McSweeney in the Carbon Brief, 5. Here's how reproductive health rights for women can help end poverty. By Valerie Moyer in the Aspen Idea