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But such tests need to be done with random sampling, ensuring that the people being tested are representative of the geographic, social, racial and other conditions. There are also questions about the accuracy of the blood tests being used. Scientists have found that some of them aren't reliable enough, with too many false positives and false negatives.

But what’s the real reason they are all coming here? Venture capitalist Greg Gottesman and Seattle entrepreneur Dave Schappell, speaking on a panel in Seattle this week hosted by Barokas Public Relations and GeekWire, summarized it in one word: Microsoft.

But there are some obvious choices for a successor among the company’s top executives: Amazon Web Services CEO Andy Jassy; Senior Vice President of Worldwide Business Development Jeff Blackburn (who is on a year-long sabbatical); and Dave Clark, the senior vice president of worldwide operations, who is taking over for Wilke.

But while the ASEAN has made some gains, Lim said most members of the regional bloc have a problem with "biodiversity accounting".

But while some scientists have welcomed A-listers' renewed zeal on climate change, others have questioned whether Tinseltown's jet-set elite are any sort of example to follow.