Local and national public-interest groups, as well as Havasupai Tribe members, delivered more than 17,000 petition signatures to Gov. Katie Hobbs today urging her to use her authority to close the Pinyon Plain uranium mine that threatens the waters of the Grand Canyon and the Havasupai Tribe.

Supermassive black holes at the hearts of active galaxies may be churning out a lot of the universe’s high-energy neutrinos.

The worst part about flying isn't the flight itself. It's not even airport security. What's always a pain is boarding the aircraft. There's something utterly chaotic about the process, from the jumbles of people crowding the gate to the shuffling down the aisle before being blocked by someone in front of you attempting to put their bag in the overhead bin (which they'll often do the wrong way). There must be a better way, so why do airlines board front to back?