Title text:
Despite a reputation for safety, the temperatures and surprisingly high pressures make them even more dangerous than the air kind, but the NTSB refuses to investigate accidents because they insist there is no ‘transportation’ involved.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3153/
As long as the heater doesn’t fail in the middle of the night.