Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

I’m orange, I wear a green hat and I sound like a parrot. What am I?

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

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

I am white when I am dirty, and black when I am clean. What am I?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

What does this rebus puzzle means ?

You are a prisoner sentenced to death. The Emperor offers you a chance to live by playing a simple game. He gives you 50 black marbles, 50 white marbles, and 2 empty bowls. He then says, 'Divide these 100 marbles into these 2 bowls. You can divide them any way you like as long as you use all the marbles. Then I will blindfold you and mix the bowls around. You then can choose one bowl and remove ONE marble. If the marble is WHITE you will live, but if the marble is BLACK... you will die.'

How do you divide the marbles up so that you have the greatest probability of choosing a WHITE marble?

Can you replace the question mark with the correct number?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.