What are your favorite Science in a Nutshell kits?

[Pster]

I just checked them out after reading about them on another post. They are great!

(we are doing earth science right now if that helps - but in general - I'd like to know what the best kits you have used there have been!)

ty!;)

[EKS]

Of those we liked the levers and wheels ones quite a lot. The pulleys one was terrible and the gears one was boring. The work one wasn't very inspiring either.