Look at the picture and find out which square is not linked with any of the other squares.

What jumps when it walks and sits when it stands?

What is the next number in this matchsticks series riddle?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

A blonde put eyeliner on her head. Why?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

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

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?