Which wheel of car does not rotate when you turn your car right?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

By using 'because' continuously three times, can you make an English statement ?

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

What is the fastest way to double your money?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?