Refined, affordable,self propelled, stealth, mini-vibrator
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It's difficult to say. A lot of things that we see as "new" were actually invented a while ago and just took a while to get to market. Wi-fi has been around since the late 1990s. Lithium batteries were invented in the 1970s. Touchscreen displays were invented in 1965. Few things that have actually been invented since 2000 have been on the market long enough to make big impact, unless you count things that were just improvements over existing inventions.
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21st century is not yet finished. We cannot tell what might be invent in the future.Ask this question again at the end of 2099.
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easy the internet