chr

   Then, the ejected debris that created the canyons likely soared over the lunar surface and then collided with it at speeds of about 2,237 miles per hour (3,600 kilometers per hour).

Oddly adding a veil of precision to an estimate of a kilometre per second.

chr

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Climbing may require concentration, try indoor autobelaying. It requires effort to think about anything but the next move. Perhaps that will start you on growing back the ability to focus.

chr

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@mauvehaus, with your idiosyncratic spelling of emacs as "eMacs", you put Stephenson in a bad light. He knows how to spell. And edit.