Mystery Science has made many of their digital science lessons free and available with no account! The mini lessons feature a 15-30 minute science lesson that is all digital. The full lessons have both a video component and a hands-on activity.
Mini Lessons
Who invented pizza?
Can animals laugh?
What's the biggest tree in the world?
Why do we get hiccups?
How do germs get inside your body?
How does hand sanitizer kill germs?
Full Lessons
Why do woodpeckers peck wood?
How can you find animals in the woods?
Have you ever watched a storm?
What will the weather be like on your birthday?
What's the biggest excavator?