#3094: Mass Spec

XKCD comic, described below.
Transcript

[Ponytail, wearing a lab coat, is giving a balloon to Cueball. Behind Cueball, there is a ramp on the ground, a magnet hanging from the ceiling and a target on a poster on the wall.]

Ponytail: Rub this balloon against your head, then go jump past that magnet toward the target on the wall.

[Caption below the panel:]

Before the bathroom scale was invented, the only way to weigh people was mass spectrometry.

(Sourced from explainxkcd.com)

Patients at least found it to be an improvement over Millikan's incredibly messy and unpleasant oil drop suspension procedure.

ExplainOriginal