This is today's edition ofThe Download,our weekday newsletter that provides a daily dose of what's going on in the world of technology. These companies are creating food out of thin air A new crop of biotech startups, armed with carbon-guzzling bacteria and plenty of capital, are promising something that seems too good to be true....

Dried cells-it's what's for dinner. At least that's what a new crop of biotech startups, armed with carbon-guzzling bacteria and plenty of capital, are hoping to convince us. Their claims sound too good to be true: They say they can make food out of thin air. But that's exactly how certain soil-dwelling bacteria work. In...