What is the coolest technology that we now have?

Twenty tears ago I thought the CD burner was the coolest thing to come out. They cost over a thousand dollars and the blank disks were 3 bucks apiece. The drives themselves were very slow and the process sometimes would crash and you would have to throw the disk away and get a new one. However, it gave rock bands the ability to burn their own CDs and sell them at concerts. You could save 650 MB of data or copy a music CD.

What is the coolest technology that we now have?
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