Ordered by topics, not by significance or by quality:
Vlad TV (djvlad) https://www.youtube.com/user/djvlad
DJ Smallz Eyez 2 https://www.youtube.com/channel/UCxca_6zloKOyPJF_DnSqtKw
Kay Kim https://www.youtube.com/user/2kaykim
Bill Still The Still Report https://www.youtube.com/user/bstill3
Dr. Eric Berg DC https://www.youtube.com/user/drericberg123
SciShow https://www.youtube.com/user/scishow
SciShow Space https://www.youtube.com/user/scishowspace
Nicki Swift https://www.youtube.com/channel/UC1DGpYiEiqBrQtYXFbLhMVQ
James Corbett corbettreport https://www.youtube.com/user/corbettreport
serpentza : https://www.youtube.com/channel/UCl7mAGnY4jh4Ps8rhhh8XZg