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Never heard of Transsion before:
Transsion sells mobile phones in Africa, Middle East, Southeast Asia, South Asia, and Latin America. It operates mobile phone brands Tecno, Itel, and Infinix, as well as after-sales support service Carlcare and accessories brand Oraimo
Eratosthenes calculated the circumference of Earth more than 2000 years ago with a stick and counting steps.
https://en.wikipedia.org/wiki/Eratosthenes