Dr. Universe: Why does water in ponds not get soaked up by the dirt at the bottom? – Rocky, 11, California. Dear Rocky, That’s a great observation. If we investigated the bottom of a pond, we ...

Mini ponds can be made from plant pots, old sinks, buckets – anything that can hold water (Credit: Heather Stuckey) When the BBC's Katherine Latham made a pond with just a plant pot, some rocks ...