This Brilliant Inventor Claimed He Made a Deadly Laser-Powered Ray Gun. Historians Still Don’t Know if It Was Real.
created: March 14, 2025, 6:33 p.m. | updated: March 20, 2025, 9:21 p.m.
<p>Was Harry Grindell Matthews a fraud, or a genius ahead of his time by a century?</p>
9 months, 1 week ago: Latest Content - Popular Mechanics