Top science news headlines for the week 20

Phys.org™ is a leading web-based science, research and technology news service which covers a full range of topics.

Phys.org is a part of Science X network. With a global reach of over 10 million monthly readers and featuring dedicated websites for science (Phys.org), technology (Tech Xplore) and medical research (Medical Xpress), the Science X network is one of the largest online communities for science-minded people.