I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

There were three women in all the swimming costumes!
One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Can you find the dog hidden in a group of pandas?

Can you divide the below-given shape into four equal and identical pieces?

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

There are forty elephants and they have forty-fore heads. How can this be possible?

What can go through glass without breaking it?

How can one talk without saying a single word?