Amanda Reed is a commerce updates writer at Popular Science. She makes sure all product round-ups are up-to-date, shares deals happening all over the internet, and reviews various gizmos and gadgets. She lives in Pittsburgh with JunkJunk, a handsome, sad-looking tuxedo cat who only wants wet food and attention.
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer_public/d1/82/d18228f6-d319-4525-bb18-78b829f0791f/mammalevolution_web.jpg "How to Make a Mammal in Nine Evolutionary Steps")
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