What four weights can be used to balance from 1 to 30 pounds?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

The answer I give is yes, but what I mean is no. What was the question?

A hen, a dog, and a cat are stolen. Three suspects are arrested named Robin, Steve, and Tim. The police are sure that all of them stole one of the animals but they don't know who stole which animal.

Sherlock Holmes is appointed to identify and is provided with the following statements from the investigation.

Robin - Tim stole the hen
Steve - Tim stole the dog
Tim - Both Robin and Steve are lying. I neither stole a hen nor a dog.

Sherlock is somehow able to deduce that the man who stole the cat is telling a lie and the man who stole the hen is telling truth.

Can you help him find out who stole which animal?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

Can it be possible to build a house that has all its four walls facing towards the South?

What has many keys but can’t open a single lock?

What makes this number unique: 8,549,176,320?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?