Try this science experiment with children over the course of several days. Fill up 4 vases with different coloured water and put 1 white carnation in each one. Watch the flowers over the next four days change to the colour of the water.
Great science activity for Early Years or Year 1, have a look at this Blog for more details. Which materials will stop Humpty Dumpty breaking when he falls off the wall? Lots of opportunities for prediction and discussion