Code will remove grey area around stem cell-based technology and ensure responsible research, say scientists

Biological models of human embryos that can develop heartbeats, spinal cords and other distinctive features will be governed by a code of practice in Britain to ensure that researchers work on them responsibly.

Made from stem cells, they mimic, to a greater or less extent, the biological processes at work in real embryos. By growing them in the laboratory, scientists hope to learn more about how human embryos develop and respond to their environment, questions that would be impossible to answer with real embryos donated for research.

Analysis shows hippos get all four feet off the ground at once up to 15% of the time when at full pelt

It takes a scientific mind to see the grunting hulk of a hippopotamus and wonder whether, given sufficient motivation, such an improbable beast might ever become airborne.

And so to researchers at the Royal Veterinary College in North Mymms, Hertfordshire, whose painstaking examination of footage of the creatures revealed that when the hefty herbivores reach top speed they do indeed take off.