9 Confusing Concepts Only 30% of People Understand

Spelling, correct present tense usage, understanding multiple languages, and advanced algorithms are only a few impressive life skills to master. Regarding confusing concepts, nine were voted top of the list.
1. ‘Advanced' Math
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Thank you to Euclid for geometry, Hipparchus for trigonometry, and Muhammad ibn Musa al-Khwarizmi for algebra. Are we truly grateful?

“Any math harder than basic algebra,” was one Redditor's post. 

We agree. 
2. Chopsticks
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