Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.

Richard Fishacre challenged the scientific orthodoxy of his day, and contemporary astrophysics has vindicated his position.

During the 1240s, Richard Fishacre, a Dominican friar at Oxford University, used his knowledge of light and color to show ...

Viscous fingering occurs when a thinner fluid pushes a thicker, more viscous fluid in a porous medium, like underground rock, ...