T&K Science Kits Thames and Kosmos
A bit pricey, but worth it. Some examples of kits include: DNA Genetics, Alternative energy generation (wind, solar, fuel cell), microscope, gears, electronics, radios, mini-computer processor, Earthquakes and Volcanos, Skeleton Kits,
Charlie's Playhouse Charlie's Playhouse
"Games and Toys Inspired by Darwin". Toys for teaching small kids the basics of Charlie Darwin's Theory of Evolution.