Usain Bolt brings a crowd and a response anywhere he goes. So, we thought, those who are not here in Rio, in the Engenhao Stadium, need to hear the real thing. This recording is from the 100 meters heat one, that Usain Bolt ran in. This was the loudest sound we have heard in a day and one half. There were 50,000 plus in the stadium this morning. And the sun was out, and the crowd was fantastic. Semi finals and final tomorrow! Should be fun!