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I think that the invention of the calculator was important for humanity. In the past, people had to do the calculations by hand but with the invention of the calculator, people can get the solutions in a faster way.

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Drinking water and sewage system!
We are so privileged to have a drinking water and sewage system. In other places, they do not have these, which is the main cause for diseases and the expected uncomfort of not having them.

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I think one of the greatest inventions is the bicycle.In today's world is necessary to go to different places and arrive to a place on time.Also , bicycles are great for people that want to do some exercises while going to an specific place .For people that are in a age where they can't drive or can´t buy a car , bicycle are a great way of transportation.

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I think that Air Conditioner is most grateful. There are many different climates and temperature in the earth. Air conditioner can give us a comfortable environment.

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Yesterday, I thought my refrigerator stopped working. Luckily it's okay today. It made me realize how important it is to have this appliance to keep my food cool and frozen. It's especially essential in the desert where I live. Food spoils really fast here in Arizona.