There was speculation last week that Bill Gates might be headed back to Microsoft, but AllThingsD squelched the rumor with a quick call to Gates's chief of staff Larry Cohen, who said it wasn't true. Now we have the words coming straight from the co-founder's mouth — "I made the transition to work full-time on the [Bill & Melinda Gates] Foundation, and that'll be what I do for the rest of my life," Gates said during an interview with Fairfax Media in Australia. However, he also said he'll continue to provide advice to Microsoft, as he has since he left the company to do full-time philanthropy in 2008. Gates could be bluffing, but the way his face lights up when he talks about mosquitos and bananas indicates he sincerely loves his current work. The full interview is just over four minutes long, so go watch it at The Sydney Morning Herald.