THIS year has been full of scientific discoveries but some were far weirder than others.
From a part-human, part-monkey embryo to a brain blow that grew eyes, we've rounded up some of the weirdest science moments of 2021.
First part-human, part-monkey embryo
Back in April it was announced that the first part-human, part-monkey embryo had been created by scientists in California despite ethical concerns.
Researchers grew human stem cells in monkey embryos to try and better understand how the cells communicate.
The controversial embryos were made at the Salk Institute in California.
They're scientifically known as monkey-human chimeras.
Human stem cells, known for the ability to become different types of cells, were injected into macaque embryos in a petri dish.
The scientists hope their work could be used to create organs for transplants and teach us more about human development and disease progression.
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