The image presents a grid of black dots that initially appears simple. However, prolonged staring reveals an illusion where ...

Your eye doctor may be able to give you an Amsler grid to use at home, or you can find one online to print. The basic grid just requires black ink and normal computer paper.

ORNL's "black box" grid modeling method protects proprietary information about the inner workings of equipment while providing an accurate simulation of grid behavior at least 10 times faster than ...