I can write cow in 13 letters.

Can You?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

How many triangles can you find in this given picture?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

How many times do a clock's hands overlap in a day ?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

What is the next number in this matchsticks series riddle?