This part made me chuckle. Tell your husband that my son is six and last May his passion was chemistry. He saw ME looking something up in a chemistry book that I had picked up as a resource at some yard sale. Looking over my shoulder he spotted the little cute round ball diagrams of molecules and asked what they were. I explained, and there was no turning back. He was in love with chemistry for months, the house was covered from stem to stern in clay models of molecules and drawings of them, and he even did a chemistry display at the homeschooler's fair, as shown on his adorable video on YouTube:
(just a minute and a half long)
Right now he's studying musical instruments. On his own!! He learns their names, their sounds, their materials, their classification, their parts...he draws them and makes them out of clay, we watch YouTube videos of them,study them online, see them in concerts..... You just never know what a kid is going to fall in love with learning. And with unschooling you can learn it at whatever preposterous age you want! :-)
How old is he in this video???