Alzheimer's drug breakthrough, and sugar in space

A new drug called Trontinemab, which could stop Alzheimer's disease, is about to start clinical trials. How does it work? Also, scientists at the University of Oxford have created a vaccine to fight Ebola; researchers have documented three different types of severe pneumonia; and why the discovery of sugars in space matters. Like this podcast? Please help us by supporting the Naked Scientists (thenakedscientists.com/donate)