When Jamaican Usain Bolt smashed the world record in the men’s 200m last night in Beijing it was a historic moment. Not only because the record of 19.32 seconds stood for more than 10 years, but because his speed set new parameters on what human beings can achieve. What makes his 19.30 world record even more incredible is that it was achieved with a head wind, and at his fastest Bolt was clocked at more than 30mph.