A Waymo car went up in flames in San Francisco's Chinatown after a crowd surrounded it, scrawled graffiti, smashed windows and then threw a firework inside the driverless vehicle in the middle of a crowded street Saturday night. Nobody was in the car and no injuries were reported, police and company officials said. The San Francisco Fire Department was called to the scene about 9 p.m. in the 700 block of Jackson Street, authorities said. Chinatown was bustling as people celebrated Lunar New Year. Videos posted on social media by software engineer Michael Vandi show someone using a skateboard to crush the white Jaguar's windows as the car's rooftop sensors continued to turn.

Despite their incorporeal form, memories have a way of becoming a very real part of our identity, like the pattern of freckles on your face or your favorite jacket might. Remembering a childhood friend while gazing off at a field of dandelions may be pleasant, but being sucked back into a bad memory -- a difficult breakup or a traumatizing loss -- can be unbearable. But what if, a la Eternal Sunshine of the Spotless Mind, we could simply erase those memories? It's something being explored, but Philipp Kellmeyer, a neurologist and head of the Neuroethics & A.I. Ethics Lab at the University of Freiburg, has several concerns. High among them is identity.