Theoretical astrophysicist proposes solution to enigma of Crab Nebula's 'zebra' pattern
A theoretical astrophysicist from the University of Kansas may have solved a nearly two-decade-old mystery over the origins ...
A look at Rafael Nadal's 22 Grand Slam titles as he prepares to retire after the Davis Cup
What He Did: Became the first man in 57 years to win an Australian Open final after dropping the first two sets. What He Said ...