There are now a record 1,826 billionaires in the world says Forbes magazine
According to the Hurun Global Rich List for 2015, UK was on fifth place with a total of 80 billionaires.
Gates was taking part in an 'Ask Me Anything' session when he said he 'feels pretty stupid' for not learning another language.
Microsoft co-founder Bill Gates expresses concerns about bitcoin volatility as prices plummet.
Bitcoin, litecoin and dogecoin stabilise, rounding off positive week for cryptocurrency markets.
US businessman Donald Trump is considered one of the richest men in the world under the report.
Self-powered machine that turns faeces into fresh water developed through Gates Foundation.
The magazine includes a step-by-step bomb making guide, and advice on how to evade airport security.
Price of bitcoin jumps following Microsoft's acceptance of the cryptocurrency
Microsoft's acceptance of bitcoin for Windows, Windows Phone, and Xbox causes cryptocurrency price surge
Robots will probably develop the capacity to replace or destroy humans - how will we handle that?
Bitcoin's price bombs but fresh support comes from Microsoft founder Bill Gates
Bitcoin finds another prominent advocate in Microsoft founder Bill Gates.
The Aoni condom broke Okamoto's Guinness World Record last year but Okamoto still claims to be the thinnest.
Lawyers at the State department say participation in the challenge is against federal ethics rules.
IBTimes entertainment reporter Toyin Owoseje rounds up the showbiz stories of the week.
Bill and Melinda Gates Foundation first bought G4S shares in June 2013.
China is giving less for charity despite a large number of billionaires.
Bill Gates pressured to divest G4S stake because of company's role in torture of Palestinians
Facebook billionaires lost $4.2bn in total since market closed on 2 April.
Sergey Brin, Larry Page, Jeff Bezos and Elon Musk also lose money but Larry Ellison gains.
Ballmer's fury over board opposition to Nokia acquisition said to be the last straw.