A bunch of flat-earthers went to Antarctica to see if the midnight sun was real. Turns out it was.

Jeran from Behind The Curve was one of the ones to flip, and since then, he's been making videos on how the earth is actually round.

He has a lot of thoughts on what it actually takes to convince other flat-earthers. I found it somewhat interesting: https://www.youtube.com/watch?v=1grMf17PeEk