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

Many solar eclipse maps use clean lines to represent the path of totality, but the reality isn't so clear cut, and those maps ...

Alison Bulman, LCSW, is a psychotherapist in New York. She is seeking representation for her book, Mindfully Yours: A ...

Probabilistic models, such as hidden Markov models or Bayesian networks, are commonly used to model biological data. Much of their popularity can be attributed to the existence of efficient and robust ...