I think the most important invention is an internet. It's useful now for many people. You can contact with people by internet, you can also find many informations and learn. It's possible to earn money - for example if you sell some second-hand things. You can help children, animals etc. when you participate in charity auctions and ask people for help or advice. You save a lot of time, when you go shopping online, pay bills on the internet or make reservations, but especially the internet is a good kind of entertainment for us.
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