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@pbsspacetime
PBS Space Time
If you're a physics or astronomy nerd, PBS Space Time is the best thing since sliced bread. The channel as in-depth as a graduate-level course but with entertaining visuals and a layperson-friendly style.
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@crashcourse
Crash Course
John and Hank Green launched this channel with a World History and Biology course respectively. It has grown to over 45 courses on a wide variety of subjects. This is YouTube at it's best: guilt-free because it's educational but genuinely entertaining.
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@TechnologyConnections
Technology Connections
From vintage VHS players to portable air conditions this creator investigates and then educates us about the everyday technology that makes our lives more comfortable.