1037
If it wasn't in an encyclopedia, you just trusted word of mouth.
(startrek.website)
People tweeting stuff. We allow tweets from anyone.
RULES:
Teacher should have shown you how a number line extends forever in both directions (no reason to think she should have known about imaginary numbers making it extend orthogonally as well)
The teacher probably had no idea what negative numbers were, and if they did, had no training on how to explain that to a six-year-old.