And remember, mankind is not the science-community alone. What did it bring my neighbor, my baker, the postman, the policeman around the corner, etc.?
Some low hanging fruit:
- All computing devices and most electronics use transistors and amplifiers that rely on (and were invented only with knowledge of) certain quantum mechanical principles.
- GPS relies on atomic clocks which in turn rely on knowledge of quantum mechanics.
- Lasers rely on quantum mechanics and are used for communication, medicine, industry, military, law enforcement, research, commercial products, and entertainment. List taken from lasers wikipedia.
There are many many more but these come to mind quickly.