The transportation secretary’s six-part YouTube series is fueling ethical concerns over family adventures funded in large part by corporate sponsors regulated by his department.

© Kenny Holston/The New York Times

In India, some people are strapping cameras to their bodies to collect data on how humans move and train A.I.

In the fast-growing field of data annotation, workers in a small city in south India train A.I. to improve how it performs tasks traditionally done by people.

© Anindito Mukherjee for The New York Times

Werner Kalecinski is a social media sensation among young Germans. How did he go from heartbroken widower to partying on a yacht?

© Lena Mucha for The New York Times