"
Asgard is now the name of a large clan of microbes. Its members,
which are named after Norse gods like Odin, Thor, Loki, and Heimdall,
are found all over the world. Many of them are rare and no one has
actually seen them under a microscope. But thanks to their DNA, we know
they exist. And we know that they are singularly important to us,
because
they may well be the group from which we evolved."
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