#3085: About 20 Pounds

XKCD comic, described below.
Transcript

[Cueball and Ponytail are standing in front of a pentacle with lit candles at the corners. A black sphere, the oracle, is floating above the middle of the pentacle.]

Ponytail: Dear oracle,

Ponytail: What is the nature of dark matter?

Oracle: It's about 20 pounds.

[Close up of oracle]

Off-panel: What?

Oracle: Dark matter is a particle. It weighs about 20 pounds.

Oracle: It only interacts through gravity.

[Same view as first panel]

Cueball: Only gravity, huh?

Cueball: So none of our experiments are really going to tell us any more about it, then.

Oracle: Afraid not.

[Same view as first and third panels, except Cueball lifted his forearm.]

Cueball: So what do we do?

Oracle: You should go out for burritos.

Ponytail: How will that help?

Oracle: Well

Oracle: Burritos are pretty good.


(Sourced from explainxkcd.com)

In addition to gravity, burritos interact through the strong, weak, and electromagnetic forces, which is believed to be a major contributor to their popularity.

ExplainOriginal