An invention/product that you just couldn't understand how it worked, An invention/product that you think is absolutely perfect, An invention/product that you thought was quite promising, but never really got off the ground, An invention/product that you weren't absolutely convinced would work well, but that you bought anyway, A product that you were totally not convinced was going to be successful, but actually turned out to be very successful , A product/invention that you really like but you think only a few people know about.

question, inventions

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