Rather than pick one, I’ll name a few:
1. Penicillin – Antibiotics have saved millions and millions of lives over the last 100 years.
2. Modern agriculture (not really an invention?) – our world population has grown hugely in the last 100 years(2 billion to 7 billion) but we have improved farming methods to feed all of these extra people.
3. The internet or World Wide Web – This has a huge effect on research, politics and communication.
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