Do People Who Look Alike Share Genes?

Some scientists suspect people will have as many as eight doppelgangers who look just like them. A recent study even found that people who look alike also share similar genetics. Two young ladies share similar-looking baby pictures and have the same birthday. Sometimes doppelgangers achieve overnight fame. Just last month, college professor Sean McArdle met his doppelganger when they swam past each other at a pool in Las Vegas.