It's no secret—there's a lot of energy held just a few thousand feet under Earth's surface. To harness any sizable amount of our planet's underlying geothermal energy for steam power, we would have to bore more than two miles into the crust. Unfortunately, the current drilling process is prohibitively expensive for most interested parties, ranging from $5 to 20 million depending on the depth desired.
Owls are some of the most gifted and silent hunters on the planet, able to swoop down on prey without a sound. Their stealth is all in the wings, which are specially structured to reduce noise. Now, scientists have figured out a way to take that unique quality and create materials that can make giant machines like wind turbines run quietly.