#660: Sympathy explain

Sympathy Tips for Physicists

[Cueball and friend are talking.]

Friend: The moment my brother died, I felt a searing pain in my heart.

Right:

[Cueball places his hand on the friend’s shoulder.]

Cueball: I’m so sorry.

Wrong:

Cueball: Was it instant, or was there a speed-of-light delay?

Very Wrong:

[Cueball thoughtfully puts his hand on his chin.]

Cueball: If it was instant, with the right arrangement of moving reference frames, we could use this to send signals back in time and violate causality! How many remaining siblings do you have?