Aha! I knew we had a thread about internet series of videos…
Been catching up on some Kurzgesagt videos recently. Wanted to share some.
Fitting for October, this one’s a pretty scary one. The Brain-Eating Amoeba. Incredibly deadly, but very rare.
Still, be warned if watching this at night 
This one’s a lot more cheerful and helpful. Love some good mental-health advice stuff from these guys.
If you want to get a headache from some math and scale comparisons, this is it. (I think I remember some of the details about plant cells from The Magic School Bus back in the day!)
Also hey Acci, it’s that quantum foam stuff you mentioned once!