C'mon,guys...... The cup jock. Altho' I s'pose this should be in the "gender specific" section of "The World's Greatest Invention".
The smartphone. When I was a kid arguments could go on for hours. Now everyone can just google the right answer on the spot.
Yet people still have extensive arguments, and even with a web browser open don't bother to Google. To the point that this web site exists LMGTFY Would you believe that arguments still go on in this day that the world is round/flat?
Glasses and contact lenses do not mix well with contact sport; I've thought about laser eye surgery so I can see without the damage from to glasses or slipped contacts. Maybe something for another topic, short sighted observation skills when in the early stages of self defence to read body language etc.