You can sign up for free to Mystery Science by using this link: https://mysteryscience.com
Children don’t need accounts or logins; they just click on the links to access videos and learning materials. Here are some examples:
What is the most dangerous animal in the world?
Why do cats purr?
Why is the sky blue?
Can animals get sunburn?
How does hand sanitizer kill germs?
How do germs get inside of your body?