I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Suppose that you are trapped on the surface of a frozen lake. The surface is so smooth and ideal that there is no friction at all. You cant make any grip on the ice and no wind is blowing to help you out. You have just a mobile phone with you which has got no reception disabling you to call for help.

How will you plan your escape before you freeze to death on the frozen lake?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

What has no start, end, or centre?

During which month do people sleep the least?

Can you solve below mathematical equation?

2^1234 - 2^1233

Why is it very easy to weigh a fish?

Replace the question mark with the number below given a simple math problem.

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?