Carl Sagan Predicted The Mess 2021 Would Be 25 years Ago - YouTube
June 12, 2022 at 8:09:16 PM PDT * - permalink - -

- https://www.youtube.com/watch?v=nGanLUnjoPI

Carl Sagan on the Existence of God - YouTube
December 10, 2021 at 5:09:38 PM PST * - permalink - -

- https://www.youtube.com/watch?v=ML4kiFCKZGo

4th Dimension - Tesseract, 4th Dimension Made Easy - Carl Sagan - YouTube
April 10, 2018 at 11:30:00 PM UTC - permalink - -

- https://www.youtube.com/watch?v=N0WjV6MmCyM

Cosmos - Carl Sagan - 4th Dimension - YouTube
April 10, 2018 at 12:40:29 PM UTC - permalink - -

- https://www.youtube.com/watch?v=UnURElCzGc0&feature=share