The music mogul took poll position after earning a staggering £50 million in the last year - £15 million more than Cowell's earnings in 2008.
His latest accolade is proof the 50-year-old star's success shows no sign of ending anytime soon. A $1 billion deal with Sony will see him take part-ownership of his label Syco, entitling him to 50% of its profits, the ability to sell the X Factor and Britains Got Talent formats to even more countries (making Cowell an estimated £500 million by 2012), and gives Cowell joint control of artists produced by the shows, including Leona Lewis, Alexandra Burke and Susan Boyle, whose debut album was the fastest-selling record in history.
Tools designed to ensure computer code in smart cars does not crash has been inspired by hungry penguins.
The rounded sleeping capsules send guests drifting into ocean before arriving on desert island by morning.
Sitting on the saddle activates the part of the brain responsible for learning, a study has claimed.
Scientists are appealing for more people to donate their brains for research after they die.
Life on Earth may have arrived from Mars on an asteroid, scientists have claimed.
Lunar mission scheduled at the end of 2017 could find out if beer can be brewed on the moon.
A bottle used to teach children how far litter can travel ended up on Scottish beach after 8,700-mile journey.
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