This one seems pretty self explanatory...color a paper towel with different markers and stick it in water. Watch as the colors bleed up the towel to see what inks were used.
This one involved water transferring from one glass to the next, eventually having two glasses with the same water level. But apparently our paper towels were TOO absorbent as it took all afternoon for this one to work. And the colors didnt blend too well either. Next time I'd use napkins to see if it goes faster.