I travel all around the world but always stay in the corner. What am I?

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.

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

1. What does:
TIM JOB
represent?

2. What does:
MO_ _
represent?

Can you decipher the two rows to find the hidden word?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

Why is 6 afraid of 7?

I have feet, but no legs. Which animal Am I?