Rob is taller than Edwin, and Jurgen is shorter than Rob.
Of only one of the following statements, we now certainly know it is correct:

A.Edwin is taller than Jurgen
B.Jurgen is taller than Edwin
C.It cannot be determined if Jurgen or Edwin is the tallest.

What work can one never finish?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

When can we add 2 to 11 and get 1 as the correct answer?

It belongs to you, but other people use it more than you do. What is it?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

You bought me for dinner but never eat me. What am I?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

We can be boring,Or interesting.
We can be long,Or short.
We can have pictures,Or just words.
Many love us,But many also hate us.
What are we?