I've been through so many of these - but not Sixty Symbols. Thanks! Also interesting is Crash Course, made by some of the same folks as SciShow. Really more fo

I've been through so many of these - but not Sixty Symbols. Thanks! Also interesting is Crash Course, made by some of the same folks as SciShow. Really more for high school students, but interesting enough that I don't mind them repeating information I do know and I pick up on new stuff.