I feel like most extremely successful entrepreneurs and inventors looked at problems and/or inconveniences that humanity had and sought out solutions.

The automobile
The airplane
The cell phone
The smartphone
The Internet
Electric vehicles
Fast food concept

There's plenty what are some others you guys consider that changed humanity forever

Machine gun
Drones
Nuclear weapons

what did fast food solved?

extreme ultraviolet lithography

OP didn't use the word solve in his title or original post

Classical mechanics and math in general

KanyeTalk

Methamphetamines

washing machine and microwave are def up there

goon cave

Polio vaccine
Cameras
Refrigerators

KTT2 Premium ™

The algorithm®

reddit ah question

reddit

Birth control sparked the sexual revolution in the 1960s

Watched a short documentary on how the instant noodle saved billions from starvation in Asia after it was invented

Good one

Um ok...lol

you sir have won the internet today

Rolling papers

Yeah like someone replied, I didn't use solve. Talking more about how things changed the world, which can be extremely good, or bad depending on an individuals opinion

Edit - actually I did use "solved" lmao but still my post above explains what I meant. Stuff like the automobile solved something, while fastfood made another thing a lot more streamlined and convenient.

the actual papers and the album depending on who you ask tbh