<div dir="ltr"><a href="https://www.sciencenews.org/article/ligo-and-virgo-gravitational-wave-detectors-are-back">LIGO and Virgo gravitational wave detectors are back online</a><br><div><br></div><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">John K Clark</div><br></div></div>