The best invention of my past 71 years has not been computers, cell phones, ATMs, or even electric cars. For me, it was Bactine!
When growing up, running to mom with a cut or scrape often made me think twice. Why? Because she would pull out the Mercurochrome. Let me tell you, THAT STUFF STINGS LIKE HELL.
Then one day, we saw a commercial for Bactine (below).
WOW.
"Mom, you have to buy this!"
And it worked! Plus, we stopped putting mercury right into our bloodstream! (grin)