From dinosaurs to whales & humans, most species evolved with an inner ear that relies on gravity to know what's up and what's down.
But what happens when a species goes weightless? #Columbus10Years #DarwinDay
➡️ https://t.co/fToMiZsnZ1 pic.twitter.com/7LDq3ht4dC

— Human Spaceflight (@esaspaceflight) February 12, 2018