These are my favourites from the list:
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60. ABACUS, 190 A.D.
Nearly 1,800 years before the first electronic calculators, the Abacus let its user multiply, divide, add, subtract, and calculate square and cube roots ... in both decimal and hexadecimal.
Anything that is this old but still in 100 greatest gadgets has gotta be good.
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57. MATTEL MAGIC 8-BALL, 1946
Is this really one of the most important gadgets ever? Signs point to yes.
It's a classic.
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50. ETCH-A-SKETCH, 1960
Though devoid of circuitry, we think it's safe to say that this was the world's first handheld with a fully graphical user interface.
Well, it's just a fun gadget.
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25. NINTENDO GAME BOY, 1989
Bundling inventor Gunpei Yokoi's Game Boy with the highly addictive Tetris ensured Game Boy's success in the early '90s. Selling over 32 million consoles in its first three years, the Game Boy has had a slew of offspring, but none will ever compare to the original.
Never got boring. Very useful in traffic jams.
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23. TELEPHONE, 1876
Though electronic communication existed before the telephone (for example, the telegraph), it was transmitting voice by electricity that changed the world. From this sprang radio, and later television and the internet. But no other device is as much a necessity as the humble phone: No snooty artist will ever look down his nose at you in disdain and proclaim, "Oh, I don't own a phone." Without the phone, there would be no crank calls, phone sex, telemarketing aggravation at dinnertime, or drunken, embarrassing calls to your ex at 3 a.m. However, nor would there be emergency calls to 911, friendly chats, or those vital calls to Santa that keep children in line.
Communciation is pretty important. Plus, this gadget has made hilarious prank calls possible.
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20. SWISS ARMY KNIFE, 1891
Karl Elsener's first knife, which was distributed to Swiss enlisted men, featured a blade, a screwdriver, a can opener, and a punch. Today, the company Elsener founded, Victorinox, and its competitor, Wenger, offer dozens of knives featuring up to 33 different tools. Meanwhile, the name has passed into cliche as an apt description of the knife's versatility.
Already been mentioned, but these are always cool. I'd say it an ultimate gadget because you can always find a bigger one which has more built-in gadgets.