Study reveals yunnanozoans as the oldest known stem vertebrates

Scientists have long puzzled over the gap in the fossil record that would explain the evolution from invertebrates to vertebrates. Vertebrates, including fishes, amphibians, reptiles, birds, mammals, and humans, share unique ...

The art of getting DNA out of decades-old pickled snakes

Two levels underground, Chicago's Field Museum has a secret bunker. The sub-basement Collections Resource Center houses millions of biological specimens for scientists around the world to use in their research, including ...

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