There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence. Do you know what word is that?
What is harder to catch the faster you run?
I am sure no one can have two things for dinner. what are they?
What is the centre of gravity?
A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?
Why blonde cannot dial 911?
Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?
When is the top of a mountain similar to a savings account?
What has one eye, but can’t see?
A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it. How can he do that?
It's a protector. It sits on a bridge. One individual can see directly through it, while others wonder what it hides. What is it?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.