Researchers in Mexico are using satellite data to find covert graves – these could hold the remains of some of the thousands of people who have gone missing in the country over the past two decades
/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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