CR-42 Italian biplane fighter from WWII
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The positive form of "fastest" is "fast."
The world's fastest mammal, the cheetah, can reach speeds of up to 70 miles per hour, while the world's fastest fish, the sailfish, can swim at speeds of up to 68 miles per hour. Therefore, the cheetah is faster than the sailfish.
The peregrine falcon is the fastest animal in the air, reaching speeds of over 240 mph.
the fastest mixed dog is named sayde
Objects move fastest when they are closest to the primary object. In the case of Mercury, it moves fastest when it is closest to the Sun.