If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

Why is the longest human nose just 11 inches?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Who always enjoys poor health?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

What has no start, end, or centre?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?