For years, ethical issues hampered progress in stem cell research. Now, however, experts believe that new developments in reprogrammed cells will truly revolutionise the treatment of life-threatening illnesses. By Alok Jha
A graphic showing all 8 planets in our solar system, Mercury through to Neptune, to scale where one pixel = km. Scales were worked out with this very useful solar system scale calculator. Find out more about the planets on the Planet Facts page.
Genetically Modified Cattle With Human DNA Might Hold Ebola Cure