A neuroscientist tests how well someone's brain is aging. A scuba instructor explains the science behind SCUBA diving. Miranda shows how to make your own ring light. A beauty scientist shows what's inside a blow dryer and how it works.

How aquariums work to restore wildlife inside and outside of the aquarium; trapping and reducing greenhouse gases; a content creator uses science to pull pranks on her friends; how different surfaces react differently to falling objects.