1) if the sumerians hadn't invented the wheel in 5000 they couldn't have moved heavy 2) if the wright hadn't invented the first successful airplane  people might still be traveling long distances 3) if people hadn't discovered a lot of sources of oil  4) if electricity hadn't been discovered people would probably still be using candles or gaslights  5) if Dr alexander hadn't discovered penicillin in 1928 millions of people would have died 6) if we didn't have computers a lot of work would still be done with paper and pencil 

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