![](https://pbs.twimg.com/media/Dru7YIvU0AA86s0.jpg)
- 15 million+ deaths
- the collapse of four empires
- the rise of communism and fascism bloom.bg/2QBB4Os
![](https://pbs.twimg.com/media/Dru7_BdU0AADegi.jpg)
![](https://pbs.twimg.com/media/Dru8qM-VsAAHFUT.jpg)
Aviation wasn’t just used for simple scouting. It was also used for bombardment and attack missions bloom.bg/2QBB4Os
![](https://pbs.twimg.com/media/Dru9H_-X0AAfP9d.jpg)
![](https://pbs.twimg.com/media/Dru9WWDWwAAmeSp.jpg)
![](https://pbs.twimg.com/media/Dru-KPbW4AA9NzM.jpg)
- blood banks
- antiseptics
- plastic surgery
- radio signals
- synthetic rubber bloom.bg/2QBB4Os
![](https://pbs.twimg.com/media/Dru-XHOXgAIrJQY.jpg)
That trend has sadly continued – brutal wars in Korea, Vietnam, the Middle East and Africa have all inflicted broad societal harm bloom.bg/2QBB4Os
![](https://pbs.twimg.com/media/Dru-lCnWsAEe_mR.jpg)