Hello everyone:

My DS8 has developed a thirst for knowledge in some new areas, and I'm hoping you can help me find some appropriate reading material.

He has been asking lots of chemistry- and physics-related questions for several months. Each answer to a question seems to bring up more questions -- and I only took h.s. physics and freshman college chem., so thank goodness for google.

Can you recommend any good books covering these subjects, including text books? He reads at about 9th grade level, so perhaps something designed for middle school? That discusses dark matter? What keeps sub-atomic particles together? What the difference is between an alloy, and a chemical bond (if I have the terminology right?)

If all else fails, a book that explains what causes explosive reactions? smile

I'm also looking for the following resources:
Books (on 8-9th grade level) on military history, especially medieval/renaissance era?

Thanks

bk