Ancient marsupial 'junk DNA' might be useful after all

Fossils of ancient viruses are preserved in the genomes of all animals, including humans, and have long been regarded as junk DNA. But are they truly junk, or do they actually serve a useful purpose?

Solving the mammal brain size puzzle

A new study has revealed a surprising lack of support for widely-held explanations of why some mammals evolve larger brains than expected for their body size.

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