This man only has a 30-second memory span.

30 seconds is the best he can do, but sometimes it's as short as 7 seconds. Clive Wearing has the worst known case of amnesia, which he's had for the last 20 years. The only person he can recognize is his wife. He can't even remember what a conversation is about halfway through it. He doesn't recognize his children or his home.

He still remembers how to play the piano, though.