A handy random statistic from <a href="https:&#x2F;&#x2F;what-if.xkcd.com&#x2F;19&#x2F;" rel="nofollow">https:&#x2F;&#x2F;what-if.xkcd.com&#x2F;19&#x2F;</a> for anchoring the discussion:<p>&quot;Astronomer Alan Harris calculates that a person’s lifetime odds of death from a comet or meteorite impact are about 1 in 700,000.&quot;