Empire of the Sum: The Rise and Reign of the Pocket Calculator

Empire of the Sum: The Rise and Reign of the Pocket Calculator

Marsoni

M251S

$32.50

Get it in 3 business days with 1 day shipping. Friday, May 29

Empire of the Sum: The Rise and Reign of the Pocket CalculatorThe hidden history of the pocket calculator a device that ushered in modern mathematics, helped build the atomic bomb, and went with us to the moon and the mathematicians, designers, and inventors who brought it to life.

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I'm partial... I have bought Timex my intire life, they no doubt make the best watches... They take a licking, but keep on ticking is there old commercials.. True.. Great quality, keeps going after many year's... I never bought a solar watch from them prior I have to mention... It should hold up I'm thinking like their battery watches, I hope so. My favorite watch, I own a handful. Watch looks better in person... Downfall, they are trying a new band out of recycled plastic, I don't like it as much as the older bands it's soft, but feels a little strange...

WAS THIS REVIEW HELPFUL?YesReportShare

Reviewed in the United States on March 28, 2026

Verified Purchase

Amazon Customer

Port Orchard, US

★★★★★ 5

Great watch

Color: Blue/Blue

Awesome solar watch. Nice not having to bother with batteries

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Reviewed in the United States on March 30, 2026

Verified Purchase

Rick Nelson

Chelsea, US

★★★★★ 5

Solar powered

Color: Green/Green

Great watch for us older folks. The hands are large enough to see easily and the fact it is solar powered means batteries do not have to be replaced every year or two.

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Reviewed in the United States on February 22, 2026

Verified Purchase

Gary Burton

Natrona Heights, US

★★★★★ 4

Nice watch

Color: Green/Green

Very happy with my purchase, rated the purchase with 4 stars due to the band being very stiff, holds doesn't line up to fit wrist properly, don't recommend for seniors to purchase, very difficult to put on.

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Reviewed in the United States on January 6, 2026