A new technique has allowed scientists to freeze human brain tissue so that it regains normal function after thawing, potentially opening the door to improved ways of studying neurological conditions. Brain tissue doesn’t usually survive freezing and thawing, a problem that has significantly hindered medical research. In an effort to overcome this, Zhicheng Shao at Fudan University in Shanghai, China, and his colleagues used human embryonic stem cells to grow self-organising brain…