Air travel
Daytime/nighttime
Compasses
GPS
Most maps
Gravity
General relativity
NASA
Circumnavigation
Astronomy
Astrophysics
Alaska
Feel free to tell me if I forgot anything.
English
#Offtopic
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With there logic Antarctica is only a wall and there is no south pool. And if the Earth was flat we would not have magnetic field to protect us from solar radiation. Meaning Earth could not support human life.