Which gas is nicknamed 'laughing gas'?
AnswerNitrous oxide
Nitrous oxide (N2O) got the nickname because it can cause giggling and euphoria.
Science · Facts & stats
Laugh facts & stats
7 fact-checked facts about laughter, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What does the online abbreviation 'LOL' usually stand for?
AnswerLaugh out loud
LOL is shorthand for 'laugh out loud' in texts and chats.
Going deeper
What is the scientific study of laughter called?
AnswerGelotology
Gelotology comes from the Greek 'gelos', meaning laughter.
Why can't people usually tickle themselves?
AnswerThe brain predicts the touch and dampens the feeling
The brain, including the cerebellum, anticipates self-made touch and reduces the sensation.
Rats make laugh-like sounds when tickled. What are those sounds like?
AnswerUltrasonic chirps too high for humans to hear
Tickled rats emit chirps around 50 kHz, above the range of human hearing.
Expert level
In Japanese online writing, which letter is repeated to show laughter?
Answerw
'w' comes from warau (笑う), meaning to laugh, so 'www' reads as laughing.
Why do Spanish speakers type laughter as 'jajaja'?
AnswerIn Spanish, j sounds like an English h
The Spanish j is pronounced like a strong h, so 'jajaja' sounds like 'hahaha'.
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