The poor knights trying to fight a dumb fight

One of my friends believes the earth is flat. His main reasoning is because we "see the same stars every night". one day I finally indulged him. After a bit of back and forth I had to ask "do you know what an axis is?" He didn't. After I explained it he gave up the stars thing but was still clinging to flat earth so I sent him pictures I had taken at the beach (if you go to the beach and get up off the ground like on a balcony or in a building and look out over the ocean you can see the curve with your own eyes and it shows up in pictures) that he's seen before but not in a few years. Every single one he said "that's flat" so I held an envelope to each picture and sent it again and he would begrudgingly admit you can see the curve. He had other arguments but they were easy to dismantle. He ended the conversation with "you've given me a lot to think about" a few days later he said said the earth was flat. You can't make someone believe something they don't want to believe.

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