What's the only room from which no one can enter or leave

Find the next number in the sequence

1, 2, 6, 21, 88, __?

What is the fastest way to double your money?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

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

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

What's the best place to go shopping in the ocean?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different. How do you measure 45 minutes?

What kind of tree can you carry in your hand?

Some friends went on a vacation to a resort. It was raining heavily and it kept raining for thirteen days.

When it rained in the morning, the afternoon was beautiful and when it rained in the afternoon, the day was blessed with a clear morning.

Overall, the friends experienced eleven nice mornings and twelve nice afternoons. Can you find out the number of days they spent on vacation?