Friday Foolery #31: Take a trip on a rocket ship

Listen to MUSTN'TS, child,
Listen to the DON'TS
Listen to the SHOULDN'TS,
The IMPOSSIBLES, the WON'TS
Listen to the NEVER HAVES,
Then listen close to me
Anything can happen, child,
ANYTHING can be. -Shel Silverstein

Learn more about the NIH Rocket Boys.