Here’s the video: https://www.youtube.com/watch?v=4wihKnARrAw

[That's crazy fast. Jan]

Here’s the video: https://www.youtube.com/watch?v=jmiPIHABsjI

Here’s the video: https://www.youtube.com/watch?v=1xooerjYbSQ

Here’s the video: https://www.youtube.com/watch?v=R4jRLTPBiDI

Here’s the video: https://www.youtube.com/watch?v=cHGT0DgvhNM

Here’s the video: https://www.youtube.com/watch?v=CyH4Zaz3mEE

[The Flat Earthers should take note of the unbelievable brilliance of someone like this. This man is amazing. All he had was an ink pen to work with. Jan]

Here’s the video: https://www.youtube.com/watch?v=qDHnWptz5Jo

Here’s the video: https://www.youtube.com/watch?v=Tb6JcQqrZ9k&t=218s

Here’s the video: https://www.youtube.com/watch?v=cYNDL7xD7l4

[This guy comes up with really interesting stuff and his work seems solid. Also he publishes papers in scientific journals with his findings. Jan]

Here’s the video: https://www.youtube.com/watch?v=p8lKQMEYYLw