Kate Adamala started work on a cell in which the natural molecular structure is reversed. Then a possible doomsday scenario became clear.

Researchers measured acetylcholine production in participants' brains at the beginning and end of the 10-week trial.

For most of us, or perhaps all of us, it's impossible to imagine a world consisting of more than three spatial dimensions. Are we correct when we intuit that such a world couldn't exist? Or is it that ...