Generation Genius
The site has videos aimed at K-8
After you select the video you like to watch, you’ll be redirected to a new scene. There, you’ll have everything you need to teach the topic: video, discussion questions, reading material, DIY activity guide, lesson plan, teacher’s guide, and assessment (quiz).
Looking for science experiments?
Check out Sick Science! Youtube Channel.
Another great site is this —–> Steve Spangler Science.
Weareteachers.com has valuable ideas/ activities as well. Check it out!