The clouds are alive as microbes fly unfriendly skies

The clouds are alive as microbes fly unfriendly skies | Ars Technica: "On a lazy summer day, you might look for animal shapes in the clouds, but you know they’re not real. There’s nothing alive up there but the occasional flock of airline passengers, right? Well, if you’ve ever had a microbiologist friend remark that a cloud reminded them of a bacterium, they were more right than you might have realized."