Superb Opinion
It's subjective.
Some argue "language" is the most useful invention. Others that "mathematics" is the most useful. I suppose it also matters what you consider an "invention" and "useful".
But I suppose the washing machine would be up there. It not only "freed" women to work more in any field, but also opened the door for general household appliances. Whereas before most technology was either for men, business or military uses
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LOL!!! FROST FREE MINI FRIDGE, THEY LISSENED TO ME!!! xxoo
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9Opinion
A stove with an oven.
Electricity and the wheel.
The writing instrument
I guessed cell phones
I think electricity
1- Ladies' thongs
2- Computers
The wheel
electricity
Electricity
Wheel
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