Google Tag Manager (noscript) End Google Tag Manager (noscript) Skip to main content Biz & IT Tech Science Policy Cars Gaming & Culture Store Forums Subscribe Close Store Subscribe Videos Features Reviews RSS Feeds Mobile Site About Ars Staff Directory Contact Us Advertise with Ars Reprints Biz & IT Tech Science Policy Cars Gaming & Culture Store Forums Front page layout Grid List Site theme light dark Sign in John Timmer - Aug 4, 2023 2:07 pm UTC Enlarge / Pellet of LK-99 being repelled by a magnet. Hyun-Tak Kim (CC BY 4.0) 241 with cache hit 217:single/related:d29d6446a030580dc69054ef5c06dab8 empty In late July, a couple of startling papers appeared on the arXiv, a repository of pre-peer-review manuscripts on topics in physics and astronomy. The papers claim to describe ...