With his various wives, Ragnar fathered numerous sons such as Ivar the Boneless, Sigurd Snake-in-the-Eye, Bjorn Ironside, Ubbe, and possibly others. While history has proven that many of these men did ...

Research on cannabis was hotting up 50 years ago, and accessible lectures on the physics of matter from Nobel laureate William Bragg, in this week’s dip into Nature’s archive.