1. Welch Labs (Complex Numbers, AI)

2. Mathologer (Various maths-related theorems and properties)

3. Simon Roper, Colin Gorrie (Old English)

4. Jackson Crawford (Norse)

5. Doctor Mix (Synthesizers; Recreating classic songs)

6. Numberphile / Computerphile / Sixty Symbols / etc.

7. NativLang

8. Artifexian, Biblaridion, etc. -- ConLang and Speculative Biology, but also cover linguistic, geographical, and biological topics where relevant