If you were wondering why so many of the track and field athletes at the Olympics were wearing bright green shoes, here's your answer: they're all Nike athletes. Nike has decided to go uniform across the globe on bright green shoes to grab your attention (and your dollars). It's probably working.
Known as 'Volt', the shoes are striking against the red track in London. Nike says that out of all the colours on the rainbow, the human eye is most sensitive to the yellow/green zone. That means the Nike shoes the Olympians are wearing reflect more light than almost anything else on the field. The shoes are there to be bright and bold so you look at them... and want to buy them. Basically, brighter is better