Absolutely the best science curriculum for 4 to 11 year olds. My 4-year old daughter loves it. The full lessons come with activities that use easy to find materials. The mini-lesson videos are incredibly easy to understand and have great real-world images and videos of the phenomena instead of cartoons or made-up illustrations.
As a homeschooler I'm always looking for curriculum that is interesting and won't break the bank. My six year old and I have already spent an hour learning by using these lessons and we're hooked. They're really fun! There's a ton of lessons available with the free trial but I think we'll upgrade soon. What I also love about Mystery Science is it was created for teachers by teachers to help lessen the lesson planning load.
Extremely Great And Very Detailed! One Bad thing is you need to pay to watch all videos (shudders) But Other Than That! I Love it!