Rats are common where food, water, and shelter are easy to find. Signs of rat activity in your yard include holes 2 to 4 inches in diameter, rat droppings, and partially eaten fruits and vegetables in ...

An undiscovered population of ancient black holes may be lurking throughout the universe. These bottomless cosmic pits would have a lot in common with more familiar black holes; in some cases, the two ...

String theory remains our best candidate for a theory of everything, but where can it be tested? By studying black holes, says Marika Taylor. When you purchase through links on our site, we may earn ...