Yesterday, we went to our friends' house for a science experiment to map the salty, sweet, sour and bitter taste buds on your tongue. The kids tasted each liquid on the front, back and sides of their tongues using a q-tip dipped in liquid, and then colored in the parts they felt tasted each sense. (You can see her full directions at Raising the Cameron Clan.)
M was not a fan of the bitter (vanilla) or sour (lemon juice) tastes, as you can see.
Baby B spent the time playing, and was particularly in love with their ball pit. He spent much of the time rolling and swimming in the balls.