Flotsam tracking

This is a fairly long video, but it's pretty interesting. An oceanographer tracks ocean currents by where floating trash washes up ashore. It turns out there's a big collection of trash in the middle of the Pacific Ocean between Hawaii and Central America, and when a cargo ship loses 80,000 Nike shoes, it's a scientific bounty of data points. Even stranger, left shoes and right shoes end up getting steered toward different beaches.