In this issue:
"The New Origins of Technology": 3.3-million-year-old artifacts from Kenya upend the classic story of when and how humans became innovators.
"Strange News from Another Star": Alien technology is probably not causing Boyajian's star to dim mysteriously. But alternative explanations are hard to come by.
"Missing Links": Loss of some DNA during evolution may have helped create big brains and our male-female relationships.
"Schizophrenia's Unyielding Mysteries": Gene studies were supposed to reveal the disorder's roots. That didn't happen. Now scientists are broadening the search.