Mystery Science hooks children with questions they genuinely want to answer: “Why is the sky blue?” “Could a volcano pop up in your backyard?” Each lesson starts with a short, beautifully produced video, then guides an investigation using simple materials. Lessons are designed to work for mixed ages — a kindergartner and a fifth grader can both engage with the same content at different levels. The free tier gives access to some lessons; the full subscription unlocks everything. It’s one of the highest-rated science resources in the homeschool community for elementary ages.

At a Glance