IN the rabbit's retina ganglion cells have recently been found which signal the direction of motion of objects moving in the visual field 1,2. These cells give brief responses at ‘on’ and ...

Why it's incredible: The cataract is the world's biggest waterfall, taller even than Angel Falls. The Denmark Strait cataract is a submarine waterfall in the ocean channel between Iceland and ...

When you imagine a beautiful waterfall, you most likely conjure up the image of Niagara Falls, which is known for its immense height and the awesome power of the water as it strikes the river below.