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.
Use duct tape for words. Place crayons on top. Blow dry on high heat till crayons melt. Blow dry side to side to blend colors. Slowly remove duct tape to reveal words. I've seen the crayon thing before, but love the duct tape idea!