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What is time, really, and does it even exist?

COTTONE AUCTIONS This Kentucky rifle belonging to the Rochester Historical Society fetched $306,000 at auction on May 8, 2021. The price is thought to be an auction record for Kentucky rifles. To the untrained eye, the Kentucky rifle the Rochester Historical Society put up for auction appeared to be nothing special. Just a scuffed up, old muzzleloader with a scraped barrel and a crack in the maple wood frame. But an inscription inside the patch box, a...

 E-Mail LOS ALAMOS, N.M., May 12, 2021--A new theorem from the field of quantum machine learning has poked a major hole in the accepted understanding about information scrambling. "Our theorem implies that we are not going to be able to use quantum machine learning to learn typical random or chaotic processes, such as black holes. In this sense, it places a fundamental limit on the learnability of unknown processes," said Zoe Holmes, a post-doc at Los Alamos National Laboratory and coauthor of the paper describing the work published today in Physical Review Letters. "Thankfully, because m...