In a new study in Nature Biotechnology, Harvard University researchers describe how they've bioengineered an artificial jellyfish using heart cells from a rat, reports Ed Yong at Nature News. The result — a synthetic creature called a medusoid — is morphologically a jellyfish and genetically a rat.

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Under a proposed spending bill, the US National Institutes of Health would see an additional $3 billion in funding.

Researchers from the University of Oxford and the University of Sydney sequenced numerous platypus genomes to study their population history.

Robert Redfield, the new pick to lead the US Centers for Disease Control and Prevention, has faced criticism for some of his work.

In Nature this week: sequenced genomes of five additional Neanderthals, and more.