The question recently came up as to whether or not clouds have shadows. The boy thought that clouds would not have shadows, but his friend's mom told him that they did.
The next time we were outside, we were able to find a small cloud that was casting a shadow on a portion of the mountain, thereby confirming the information he had been given.
We talked some more about what shadows are, as well as whether or not a variety of other things would have shadows. In the end, we concluded that water vapour does indeed have a shadow even though it originally seemed to him that it shouldn't.
Naturally, shadow puppets followed the discussion!
Science: Observation, description