Which is heavier: a ton of bricks or a ton of feathers?

A man escapes from jail using help from his girlfriend. The investigators suspect four girls of being the man's girlfriend.

Out of those four girls, one is his girlfriend who is lying. Two of the girls are completely innocent and are speaking the truth. One of the girls is the man's sister who is helping the girlfriend lie. Following are the statements from all four of them:

Ariana: "Myrna is his girlfriend."
Jane: "Angelina is lying."
Angelina: "Ariana is lying."
Myrna: "Jane is not his sister."

Can you find out who is the man's sister among them?

Identify Me

Hint1: I am a god
Hint 2: I am a planet
Hint 3: measurer of heat

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

Can you count the number of triangles in the given figure?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

I travel all around the world but always stay in the corner. What am I?