What if you add every number?

Video about Grandi's Series:    • 1-1+1-1+... = 1/2  

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Also make sure to check out Mathologer's and Numberphile's videos on this subject, they go more in depth if you want to learn more!
Mathologer:    • Ramanujan: Making sense of 1+2+3+... ...  
Numberphile:    • ASTOUNDING: 1 + 2 + 3 + 4 + 5 + ... =...  

Attributions:
Furfur, CC BY-SA 4.0 https://creativecommons.org/licenses/..., via Wikimedia Commons
O.P.G.K, CC BY-SA 4.0 https://creativecommons.org/licenses/..., via Wikimedia Commons
Derek Leinweber, CC BY-SA 4.0 https://creativecommons.org/licenses/..., via Wikimedia Commons
SriVrushank(1840372), CC BY-SA 4.0 https://creativecommons.org/licenses/..., via Wikimedia Commons
Emok, CC BY-SA 3.0 https://creativecommons.org/licenses/..., via Wikimedia Commons