Scientists have used nanotechnology to create “selectively wet” materials that can be used to write long-lasting messages with water. The concept, called "hydroglyphics," was exhibited by scientists at Harvard who recently teamed up with a group of Merrimack, N.H., high school students and faculty to make an educational demo.
The demo, appropriately entitled "Hydroglyphics," helps people visualize the difference between water repelling and wetting surfaces. The main principle behind hydroglyphics (a combination of the words “hydro” and “hieroglyphics”) is that by changing the properties of a surface, you can make your own special prints using water. All you need is some foam stickers, a modified Tesla coil and a Petri dish.