Could this make sport safer? Tech entrepreneur Peter Thiel is backing the Enhanced Games, at which competing athletes will be allowed to take any drugs they want to.
Billionaire to launch drug-friendly Olympics
Elite cheats: The organisers claim that 44% of today's athletes already take banned drugs. Glossary
Gauls - An ancient Celtic people in Western Europe.
Asterix - The main character in a French comic book series set in ancient village of Gauls.
Usain Bolt - Jamaican sprinter Usain Bolt is the fastest human alive, with a top speed of 27.79 miles per hour compared to the rhino's 34. The world's fastest mammal, the cheetah, can reach around 75 miles per hour. The fastest animal, however, is the peregrine falcon, which can dive at up to 240 miles per hour.
Entrepreneur - A person who sets up their own business.
Corruption - When someone abuses their power for personal gain. It often involves bribery.