How many gold medals did usain bolt win in 2012 olympics?

What is the significance of the Shimano date code and how can it be used to determine the manufacturing date of a Shimano product? How do you fill bike tires with a presta valve? What are the key features to consider when choosing a bicycle for trials riding, specifically focusing on trials bikes? Household hazardous waste can be eliminated by preparing your own cleaning products using the following ingredients EXCEPT? Do fixie bikes have brakes? How can I tighten the bike disc brakes lever effectively? What are the advantages of gymnastics? What is the best bike for youth? What is the average cost of a gymnastics bar for kids? How many subscribers does Golf Digest have? What are the safety features of a quad bicycle? What could you put under a loft? Names of bones you use in high jump? What are the best road bike rim brake wheelsets available on the market? How much do quarterfinalist win in the US Open tennis tournament? Who was the top amateur golfer three years in a row? What if the golf course has no red tee markers? What are the key components to consider when selecting a bike rear wheel hub? What are the key features and benefits of the rival crankset compared to other cranksets on the market? How can resin be effectively used in repairing carbon fiber materials?