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

Marsoni M251S
Sale price$32.50
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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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4.5 ★★★★★
Based on 1867 reviews
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Verified Purchase
Brandy
Louisville, US
★★★★★ 4
100% excellence
Scent: Earthy, Nutty, Refreshing, Size: 4.06 Fl Oz (Pack of 1)
Great product!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 14, 2026
D
Verified Purchase
Dina Nezareab
Whiting, US
★★★★★ 1
Not recommended
Scent: Earthy, Nutty, Refreshing, Size: 4.06 Fl Oz (Pack of 1)
Not the batana oil you should be buying. No this isn’t the one. Definitely don’t recommend it. It has no that coffee smell of the real batana oil and has extra chemical ingredients and makes it runny almost like a liquid oil. I made a mistake buying it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 4, 2026
J
Verified Purchase
Joann Hornsby
Cuba, US
★★★★★ 3
watery
Scent: Earthy, Nutty, Refreshing, Size: 4.06 Fl Oz (Pack of 1)
The oil is watery.Easily wasted.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 28, 2026
H
Verified Purchase
H. M.
Draper, US
★★★★★ 5
Batana Oil for hair growth
Scent: Earthy, Nutty, Refreshing, Size: 4.06 Fl Oz (Pack of 1)
Great oil!! I have not used it yet!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 1, 2026
R
Verified Purchase
Ramlo Iman
Grantham, US
★★★★★ 5
Has no oily scent.
Scent: Earthy, Nutty, Refreshing, Size: 4.06 Fl Oz (Pack of 1)
Just started using it. Smells like oil not over powering. The quality is rich and it’s not runny oily. For the size of it’ll last couple months. Worth the price.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 27, 2026

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