What are Saturn's Rings Made of + NASA and MIT Make New Wing

 MIT and NASA engineers demonstrate a new kind of airplane wing. Assembled from tiny identical pieces, the wing could enable lighter, more energy-efficient aircraft designs.   Scientists have pondered Saturn's rings since Galileo peered at the planet through an early telescope in 1610. From the angle at which he observed it, Galileo surmised that Saturn wasn't a single star, but was actually three: a large middle star with two ear-like appendages sticking out of it, which he thought might be large moons.