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There is a common 9-letter word in the English language, such that if you keep removing its letters one by one, the resulting 8 words are still valid. What is this word?
Remark: The removed letters do not need to be from the beginning or the end of the word.
The word is STARTLING -> STARTING -> STARING -> STRING -> STING -> SING -> SIN -> IN -> I.
There is an ancient invention still used today in some parts of the world which allows people to see through walls. What is it?
The answer is WINDOWS.
A bus driver was heading down a street in Colorado. He went right past a stop sign without stopping, turned left where there was a “no left turn” sign, and went the wrong way on a one-way street. Then he went on the left side of the road past a cop car. Yet, he didn’t break any traffic laws.
Why not?
The bus driver was not driving his bus, he was walking.
A man was moving to a new house. He rented a moving truck, put all his belongings in it, and drove to his new place. He entered the garage with the truck and took all his belongings out of the truck. When he tried to exit the garage with the truck, he couldn’t. Why?
The empty truck was just slightly taller than the garage door. When it was packed with items, the truck’s height got lower, so the man could enter the garage. Once the items were unpacked, the truck was once again taller than door, so it couldn’t get out.
A man leaves home and makes three left turns, only to return home facing two men wearing masks. Who are those two men?
The person is a baseball player. The men are a catcher and an umpire.
A woman was standing in her hotel room, when somebody knocked on the door. When she opened the door, there was a man who said that he has mistaken his door, apologized, and continued down the corridor. When the woman closed the door, she called security to warn them about the thief. Why did she think the man was planning to rob her?
If the man really thought this was his room, he wouldn’t have knocked on the door.
Alex and Bob are playing a game. They are taking turns drawing arrows over the segments of an infinite grid. Alex wins if he manages to create a closed loop, Bob wins if Alex does not win within the first 1000 moves. Who has a winning strategy if:
a) Alex starts first (easy)
b) Bob starts first (hard)
Remark: The loop can include arrows drawn both by Alex and Bob.
In both cases, Bob wins. An easy strategy for part a) is the following:
Every time Alex draws an arrow, Bob draws an arrow in such a way that the two arrows form an L-shaped piece and either point towards or away from each other. Since every closed loop must contain a bottom left corner, Alex cannot win.
For part b), Bob should use a modification of his strategy in part a). First, he draws a horizontal arrow. Then, he splits the remaining edges into pairs, as shown in the image below. If Alex draws one arrow on the grid, then Bob draws its paired arrow, such that the two arrows point either towards or away from each other. The only places where a loop can have a bottom left corner are where Bob drew the first arrow or the grid points directly above it. However, if a loop has a bottom left corner there, then it is easy to see that it must have at least one more bottom left corner elsewhere, which is impossible.
Two twins are lying next to a king and a queen in a large room. Yet, there are no adults and there are no children in the room. How is it possible?
The twins, the king, and the queen, are all (types of) beds.
On this Dutch poster from WW2 you can see four pigs. Print the poster and try to find the fifth pig.
After folding the poster along the lines, you will get the portrait of the fifth pig, Adolf Hitler.
A man is sitting in his cabin in Colorado. Three hours later he gets out of his cabin in Texas. How is this possible?
The man is a pilot and he is sitting in his airplane cabin.
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