My Definition of Genius

Go Stuart!

https://www.kryogenix.org/code/browser/sorttable/

Can you do better though? Yes, the user must know that he can sort. What's the best way to say that? Here's my take :

If,
       the user has not exercised this function upon loading this page,
then,
     anytime
    the header fields come into view, give them a halo that fades (how cool would that be!)

In addition, the background color should change upon mouseover.

Go for it Stu!

This one seems to have hints on how to accomplish the response to mouseover : https://www.w3schools.com/howto/howto_js_sort_table.asp