Scientists injected human stem cells into mouse embryos and let them develop. One of the resulting embryos had 4% human cells after 17 days of additional maturity. Human cells were found in tissue ...

Scientists have created “synthetic” mouse embryos from stem cells without a dad’s sperm or a mom’s egg or womb. The lab-created embryos mirror a natural mouse embryo up to 8 ½ days after fertilization ...

In the wild, a mouse or rat leads a precarious life. In the city, they dodge traps, poisons, and broom-wielding humans. In the countryside, they face owls, shotguns, and more poison. As Australia’s ...

A three-year project to create a detailed 3D 'atlas' of the brain of a lab mouse is now finished. The resulting model will help scientists better understand the effects of treatments and testing ...

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A yellow-rumped mouse is spotted at the top of a 22,000-foot volcano in the Andes. "This astonishing elevation shows to what extremes life is capable of." Journalist Bonnie Burton writes about movies, ...

NPR's Juana Summers talks with Regina Barber and Emily Kwong of Short Wave about "scuba-diving" lizards, a trick to turn a mouse's skin transparent and whether finger counting helps kids' math skills.

Researchers announce the development of a mouse embryo model, complete with beating hearts and the foundations for a brain and other organs, out of mouse embryonic stem cells. Just two weeks after ...