The Son of Man. The Lamb of God. The King of Kings. The Knave of Hearts. The Sultan of Swat. Jesus of Nazareth, also known as the Prince of Peace, and in America, the God of War, was said to perform a string of miracles at the beach town of Tiberias on the Sea of Galilee in Israel. One of them involved catching a great deal of fish with one net. Another, feeding several thousand people with very little food. And yet another involved walking on water to meet a boat full of his disciples, who were caught in a sudden storm.
Now, Clarke’s Third Law states that “any sufficiently advanced technology is indistinguishable from magic.” So nowadays, the miracle of the modern fishing industry, with its deep-sea trawlers, 150-mile longlines, and space-age tracking and echolocation technology, ensure that our nets can catch hundreds of thousands of fish at a time. (Though not for much longer.) And genetic engineering, bolstered by mechanized farming and artificial fertilizers, ensures we can feed the multitudes. (Though not for much longer.) But biologically and technologically speaking, how miraculous is it to walk on water?
Not very, if you’ve got the right tools, and the right size. The most classic example of animal locomotion on the water’s surface is the water striders, or water skaters, or water scooters, or any of the other collective names for these 500 species of insects that make up the Gerridae family. They are hunters that use surface tension to their advantage; where prey might swim, they float like a bubble. Their short front legs are for grabbing, their middle pair for “skating,” and the hind pair act as rudders. The secret to their unsinkability is the hydrophobic hairs on their legs. Each leg is covered in thousands of fine filaments called microsetae that spread the weight out on the water’s electric “skin” of surface tension, and the grooves in each filament trap tiny air bubbles which add to their buoyancy. So powerful is the effect that a water strider could carry fifteen times its own weight and still remain afloat, and a few species have even adapted to walk the waves of the open ocean.
But it’s not only insects that have the ability to walk on water. A few reptiles have also evolved to stay high and dry. And more advanced insects have discovered not just how to walk on water, but how to turn water into wine.