Which plant is a traditional symbol of good luck?
AnswerFour-leaf clover
Four-leaf clovers are rare, which made them a symbol of luck.
Challenge · Facts & stats
Luck facts & stats
7 fact-checked facts about luck, chance and the science of probability, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What is the chance of rolling a six on one fair die?
Answer1 in 6
A die has six equally likely faces.
Going deeper
What is the gambler's fallacy?
AnswerBelieving past random results change future odds
Each coin flip is independent of the last.
Why is 8 considered lucky in Chinese culture?
AnswerIt sounds like the word for prosperity
The Mandarin word for eight sounds similar to the word for wealth.
About how rare are four-leaf clovers?
AnswerAbout 1 in 10,000
The commonly cited estimate is about 1 in 10,000 clovers.
Expert level
How many people are needed for a better than 50 percent chance that two share a birthday?
Answer23
This surprising result is known as the birthday problem.
Who coined the word serendipity?
AnswerHorace Walpole
Walpole coined it in a 1754 letter, inspired by a Persian fairy tale.
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