[Physicist]

There once was a fencer named Fiske
Whose thrust was exceedingly brisk
So quick was his action
Fitzgerald contraction
Reduced his rapier to a disc!

[PatrickHenry]

Barney was Frank's fraternal twin,
You've heard of these paradoxical kin,
Barney stayed home,
While the stars Frank did roam,
To return younger than he ought to have been.