ABCD

[[A boy is doing some excercises in a book. The clock on the wall says 12:50 or 13:50.]] [[Book: Chapter 15: Special Relativity Problem 1: Two spacecraft transmit messages to each other while passing at constant velocities of... ]] Boy: <<sigh>> [[Label: Meanwhile:]] [[A girl in a bubble and a spacecraft are moving towards each other. Each one has a velocity vector drawn before themselves, each showing a velocity of 0.2c.]] [[They pass each other.]] Spacecraft: We observe your speed to be 38.5%c, and your time is passing at 92.3% the rate of ours. Does this mirror your observations? Girl: Please help me. I think I'm lost. [[They continue with the same velocity vectors. The girl is looking back at the spacecraft.]] {{alt text: Maybe someday I'll get to write the Wikipedia article about this place! Wait, damn, original research.}}