Bob Lazar’s Element 115 claim dates to 1989. He later described it as copper-colored. Decades later, atomic calculations found something oddly specific.

This does not prove Bob Lazar told the truth. But it may be one of the stranger coincidences in his story. Lazar’s Element 115 claim dates back to 1989. In later descriptions, he characterized the alleged material as a stable metal with a copper-like, orange or bronze appearance. At the time, Element 115 had never been synthesized. It was eventually produced in 2003 and is now officially named moscovium. Even then, it was created only atom by atom, in radioactive isotopes that decayed almost...