A doctor who recently returned to New York City after treating patients with Ebola in Guinea has tested positive for the disease. Three contacts of the man are under observation
The African Union says member states have promised to send more than 1,600 volunteer health workers to Ebola-affected countries. The continent's slow response to help the stricken nations has come under criticism.
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Current topics in research and projects in Germany and Europe
Sensoring devices on board the Rosetta spacecraft have detected chemicals in the cloud of comet 67P/Churyumov-Gerasimenko: hydrogen sulfide, ammonia, formaldehyde and hydrogen cyanide - in other words, it stinks.
For over a century, scientists believed it was impossible to see viruses and single molecules with a microscope. But three researchers broke through this "physical limit" and are now Nobel Laureates.
Energy-saving light-emitting diodes have conquered the world. Diodes for red and green light have been on the market for 50 years. But blue was a huge challenge - until three Japanese physicists came along.
Men are said to be better than women at creating maps in their brains. But as the three winners of the 2014 Nobel Prize in Medicine show, even mice have brain cells for navigation.