The gooseneck barnacle (with a relaxed penis at arrow) is capable of a method of sex previously unobserved in barnacles, upending 150 years of theory. Image via Barazandeh, et al. Proc. R. Soc. B.

For the first year and a half after it vanished on March 8, 2014, Malaysia Airlines Flight 370 represented an unprecedented kind of aviation mystery, one whose only clues were a set of cryptic ...