Is it true that those "I, Spy" books improve mental development for children and adults?

Question

I heard this rumor so I explored that book a few days ago. It wasn't easy, but it wasn't really that hard either. However, there was this one page that had me kinda stuck for a little while...

Answer 1

those I Spy books are good for training in visual alertness and concentration.

For over-all intelligence development, you should go with a combination of reading, math, and puzzles (including jig-saw, 3-D, and word-play).

It's never too early to start. My little boy started this regimen at birth; his IQ is 170.