The ancient Celts were fierce warriors who lived in mainland Europe. But during the Renaissance, an idea took hold that they lived in the British Isles.
Tissue-based models of the human heart are being sent to the International Space Station.
In samples of organic-rich black shale, scientists found evidence for oxygen depletion and hydrogen sulfide expansion in ancient seas.
Simulations show that collisions between moons and planets may be a regular danger for possible extraterrestrial life.