What do you think about Gavin Menzies and his book 1421? Is he a dabbler or an amateur historian but telling truths?
There are a few earlier threads the FAQ on Menzies.
I like this one https://www.reddit.com/r/AskHistorians/comments/wq7tr/is_gavin_menzies_assertions_in_his_books_1421_and/
Featuring u/khosikulu.
But there are more here: https://www.reddit.com/r/AskHistorians/wiki/historians_views#wiki_historians.27_views_of_gavin_menzies.27_.221421.3A_the_year_china_discovered_the_world.22
And of course, more can always be said.