A useful layman&#x27;s explanation of gravitational waves and the LIGO experiement: <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=1Tstyqz2g7o" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=1Tstyqz2g7o</a>