THE well known after effect of movement is normally generated by moving the images of external objects across the retina 1. The present study shows that an after effect can also be generated by moving ...

Take a moment to look up at the sky. Whether it’s the clear blue of a sunny day or the overcast gray of winter, you should be able to see a familiar sight—slightly darker or fuzzy blobs that dip and ...

James is a published author with multiple pop-history and science books to his name. He specializes in history, space, strange science, and anything out of the ordinary.View full profile James is a ...