Water seems to have magic. Here it is and now it's gone! You see it and now you don't! It is water-now vapor-now a cloud! It falls from the sky! It's a pool on the ground! Now it's gone again! It runs down the river but the river is still full! It pours steadily into the great ocean, but the ocean never runs over! It appears at dawn as shiny drops of dew on the grass. Look again later and presto, the drops are gone! Now it has changed from a drop...