Youtube channels

Primitive Technology – 10 million subscribers can’t be wrong.

Smithsonian – so many options. For something short start with Burrowing Owls on Light Talks

Crash Course Kids

Crash Course – older audience – extensive list of topics from a channel that started as science-only

Oversimplified – fast and entertaining history summaries

Amoeba Sisters

Minute Earth

Bozeman Science

Veritasium

Nature PBS

Deep Look (PBS)

Domain of Science

Osman Nal – math competition problems.