the hardest pitch ever was 106 mph
Joel zumaya 104 mph
The hardest challenge I've ever faced is life.
Knuckleball
cheats to the hardest game ever
brainteasers
a curveball
Diamond. a very hard material that is the hardest substance ever, or at least discover to be the hardest substance on EARTH THAT IS
E = mc2
Fedor Emelianenko
What is the riddle
I had not given a hardest interview like this one you give
Diamond is the hardest natural mineral; nothing is harder.