@CNN: A fossilized mucus trail led to the discovery of the oldest evidence for mobility on Earth, dating to 2.1 billion years ago, according to a new study https://t.co/PcPw0xX7nY https://t.co/9GY07kTe1X

@CNN: A fossilized mucus trail led to the discovery of the oldest evidence for mobility on Earth, dating to 2.1 billion years ago, according to a new study https://t.co/PcPw0xX7nY https://t.co/9GY07kTe1X