What question can you never answer yes to?

How can you take 2 from 5 and leave 4?

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the painting?

Can you write down eight eights so that they add up to one thousand?

Can you name four days which start with the letter 'T'?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

I have branches, but no fruit, trunk or leaves. What am I?

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?

Find out the missing number in the picture attached:

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?