Animal experiments are widely used to develop new medicines and to test the safety of other products. Many of these experiments cause pain to the animals involved or reduce their quality of life ...

But headless animals called brittle stars have no brains ... Early in the 10-month-long experiment, the animals stayed hidden when the lights went out. But over time, the animals made such a ...

Japan's government approved a request for stem-cell experiments meant to create an animal-human hybrid and allow it to be brought to term. The experiment, which still requires approval from the ...