Just because the kids are at out of school for the summer months doesn't mean they should let their brains atrophy. Keep them cool and learning about science with this set of glasses featuring educational labelled cross-section graphics of the ocean, earth, atmosphere, and universe.
A four-pack will set you back just shy of £30 so you might not actually want to trust them in the hands of hyper kids. But who says the guests at your next BBQ wouldn't appreciate a refresher course in grade school Science 101? [UncommonGoods via Holycool]