Katherine C. Imus was enrolled in Georgiana Bruce Kirby’s semi-public school for girls in 1855, where she wrote a class essay ...

A tricky optical illusion challenges viewers to spot the hidden number 8 among a chaotic mix of 3s and 7s in coloured triangles.

Black holes are points in space that are so dense they create deep gravity sinks. Beyond a certain region, not even light can escape the powerful tug of a black hole's gravity. And anything that v ...