Title text:
With their 13 years recording and performing together and two humans worth of mass, the White Stripes are sandwiched neatly between gray wolves and blue whales.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3283/
Black holes don't need to be dense. A black hole the size of the orbit of Jupiter would be less dense than water.
Black holes radiate energy like a black body with a temperature that increases fast the smaller they are. Small black holes radiate all their energy really quickly.