Nonito Donaire is setting the standard for what a professional fighter should be. He enters Saturday's super bantamweight title defense against Jorge Arce sixth in the Yahoo! Sports boxing rankings ...

If you want to determine which is the best fighter jet in the world, you could look at raw performance numbers like top speed or maximum ordnance load, or look at how successful it has been in combat.

Jet fighters require clean air to operate their engines, both free-flowing and without any debris. Only one older fighter can ...