Weather: Fill the cup with water. Put shaving cream on top for a cloud. Explain that when clouds get really heavy with water, it rains! Then put blue food coloring on top of the cloud, and watch it rain. Such a cool idea! @Heidi Hullette - is this the one you pinned?
Gonna need some boy stuff soon....
Great list of reliable online resources for helping your child with reading, from birth through school age.