Science Magazine – November 10, 2023: The new issue features Mode-locked “chip lasers” generating intense ultrashort pulses of light have been the backbone of ultrafast sciences and technologies. 

AI’s challenge of understanding the world

By MELANIE MITCHELL

In thinking about the challenge of getting artificial intelligence (AI) to understand our complex world, I recalled a Twitter post from a user of Tesla’s self-driving system. The user tweeted that his car kept stopping abruptly at a particular location for no apparent reason. Then he noticed a billboard advertisement on the side of the road, featuring a sheriff holding up a stop sign. The car’s vision system had interpreted this as an actual stop sign, and slammed on the brakes.

The Scottish wildcat has been wiped out by breeding with domestic cats

After 2000 years of isolation, a few decades of interbreeding have rendered the animal “genomically extinct”

BY DAVID GRIMM

Though it lies in ruins on the northeast coast of England, Kilton Castle was once an imposing stone fortress, home to several noble families, and—it appears—at least eight cats. Archaeological excavations in the 1960s uncovered a well, at the bottom of which lay the bones of several felines dating back to the 14th century. The animals were an odd mix: Some were domestic cats, but other, larger specimens appeared to be European wildcats, a fierce, burly species that has inhabited the continent for hundreds of thousands of years.