Only one USB is good enough to connect thru internet.

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I was wondering what if the technology does not evolve. Just like the internet connection, wherein, during the old days, we will be needing a lot of gadget. before we can have an internet connection, But now, only a USB type gizmo is enough. Though the connection in this type is not always running smoothly. Yet still, internet connection will be somehow avail. How great is our technology now a days.