An engine does not have to quit to bring down an airplane; sometimes it only has to come loose. That distinction matters most ...

A camera on the second stage of Firefly Aerospace's Alpha rocket shows debris falling away and a damaged or missing nozzle shortly after stage separation April 29. Credit: Firefly ...

Many cyclists may be riding blind and risking serious injury, with more than than one in 10 having experienced an accident that they found was due to a structural failure undetected in the bike.