News Physics Elusive particle shows up in ‘semimetal’ Weyl fermions detected in tantalum arsenide Share this:FacebookTwitterPocketRedditPrintEmail By Andrew Grant July 16, 2015 at 2:00 pm This article is only available to Science News subscribers. Subscribers, enter your e-mail address to access our archives. Client key* E-mail* Log in Not a subscriber? Science News is a nonprofit. Support us by subscribing now. Subscribe