If you've been to a health food store recently, you've probably noticed jojoba (pronounced ho-ho-ba) oil lining the shelves. And while the lipid has only recently become popular in the U.S., it's been used to treat dry skin for centuries, especially in Mexico [Source: Zeichner].
Forbes released its 2015 list of the worldâs richest people, with Microsoftâs co-founder Bill Gates reclaiming the top spot from Mexicoâs telecommunications mogul Carlos Slim Helu.
She has been declared the richest woman in the world for five of the last six years by Forbes. Facebook's Mark Zuckerberg moves up five places in the rankings to number 16, with a net worth of $33.4bn. This is the first time he has been included in the list of the world's 20 richest people. The youngest billionaire in the world is 24 year-old Evan Spiegel, the co-founder of messaging app Snapchat, with a fortune of $1.5bn.