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?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

What goes up but never comes down?

Can you find the missing piece of the Porsche?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

The two towns are exactly 100 km apart. John leaves City A driving at 30 km/hr and Jacob leaves City B half an hour later driving at 60 km/hr. Who will be closer to City A when they meet?

Andrew sees a very rare bird named "Ruppell's vulture". Soon Andrew was dead. Can you explain the mystery, Mr. Sherlock?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Why do people go to bed?