Naked egg experiment- Dissolve egg shell off with vinegar and it will become a "naked egg" that can bounce. A great experiment for spring break!- We did this and K loved it! I would suggest naked egg investigation be done outside.
Hidden doors -- This company makes cabinets, bookshelves and anything you can think of that fits your existing doorjambs thus hiding the door (and also making use of the space) Not sure I like the idea of a 'gun cabinet' door.
Not that I have an empty closet, but i do like this."Closet Office" - Turn your un-used closet/reading nook into an office space. Maximize the little space with lots of shelving and storage *LIKE CORNER DESK/nook & shelving for office corner
Chels --- something like this would be cute in baby R's room, throw in purple, and replace the real pictures for the cute etsy prints! Family Picture Gallery Wall by Tatertots & Jello featuring Cut it Out Decorative Wood Cutouts. Love the color!