I was at Learning Express the other day buying a birthday gift and while I was there, I just HAD to check out the 50% off section. You just never know what you will find there.
They had Milestones in Science marked down and how could I pass that up?
So far, today, we have made a Camera Obscura, a model of the steam engine and we are working on Galileo's telescope. Joseph is having a blast with it.