Divide by 2 For Secretariat

It seems impractical to measure space shuttle engine strength in horsepower. Can anyone comprehend how fast 50,000 horses can pull a rocket? How do they even know it takes this many? Did they herd a 17 mile long line of stallions from Oklahoma to Cape Canaveral, tie them to a spaceship, smack their ribs with a jockey strap and measure speed with radar gun? That wouldn't even work, cuz horses can't fly. They'd need to use Pegasus horses or unicorns, and I doubt Tristar pictures would loan out that many, they'd need to find another animal to jump over their nifty sign at the beginning of their movies...this is just an example of the shit I think about