evidence: What about other planets? Are they flat too? One individual Weill quotes replied to a question from Elon Musk as to whether Mars is flat by saying "no" because "Mars has been observed to be round" (p. 207). By this, one assumes that "round" means spherical because in F.E. belief a planet could be both flat and round. Or flat and square. Or flat and shaped like a great big New Hampshire. Others do not believe in outer space but that the Sun and stars are on a dome high up in the sky, harkening back to medieval beliefs. More disturbingly, Weill documents the recent development of an overlap between the F.E. movement and QAnon and similar conspiracy theory groups. [...] In the late 1830s he was deeply involved in a failed utopian community. He’s famous in flat Earth circles because of experiments he claimed to have performed in a long straight canal in Bedford, England. It had been known for centuries that as a ship sailed away a viewer would see the ship both get smaller and the lower parts of the ship disappear before the upper parts did, due to the curvature of the planet. Rowbotham claimed that when he stood in the middle of the Bedford Canal ships got smaller as they moved away but he did not see the lower parts vanish sooner than the upper parts. This, he argued, showed that Earth was flat. His claim is still offered as proof that Earth isn’t spherical.