Q: Does the density of helium cause voices to sound deeper?
A: Helium is less dense than air. Sound travels more quickly through helium than it does through air. When sound travels more quickly, the tone of it raises and sounds higher.
The answer is no.

Q: Would Cyndi Lauper use milk substitute in her rice pudding?
A: Cyndi Lauper wrote a song about lactose intolerance. Lactose intolerance leads to gastrointestinal discomfort upon eating dairy.
The answer is yes.

Q: Was The Canterbury Tales written before One Thousand and One Nights?
A: One Thousand and One Nights was compiled during the Islamic Golden Age. The Islamic Golden Age lasted from 800 AD to 1258 AD. The Canterbury Tales was written in 1392.
The answer is no.

Q: Have jokes killed more people than rats in history?
A:
Greek philosopher Chrysippus was said to have died from laughter after seeing a donkey eating figs. There are only a handful of deaths attributed to jokes throughout history including King Martin of Aragon. There are an average of 30 deaths by rat attacks every century. The plague which is sometimes associated with diseased rats killed millions of people.
The answer is no.