This afternoon I heard and felt two loud explosions that shook the house. It felt like a bomb went off at the neighbor’s house. I thought it was a big earthquake because you always hear a loud sound when an earthquake starts. It turns out that Obama was in Seattle today (he lived on Capitol Hill as an infant, by the way), a small sea plane inadvertently entered the restricted airspace around the President, two F-15 fighters scrambled to intercept causing a sonic boom. I’ve never heard one before. The Pacific Northwest Seismic Network captured it on their instruments.