Know-Unknown: Know some unknown facts that will be useful to you

The Dhaka Times Desk Many events happen in our daily life which remain unknown to us. Even today there are some unknown facts that need to be known.

It takes 45 to 60 minutes to donate a bag of blood.

The number of cells in a mature human body is about 75 trillion (75×1012).

 A human infant crawls an average of 150 kilometers before learning to walk.

 It is never possible for a human to sneeze with its eyes open.

 A man can live without food for a month, but without drinking water he cannot live more than a week.

Do you know how many mosquitoes are needed to eat all the blood in a person's body? 1,200,0.

An elephant can smell water from 3 miles away.

 A baby giraffe falls about 5 feet to the ground during birth, but most of the time they are not hurt or injured.

 An egg contains all other vitamins except vitamin C.

A mosquito may weigh 2.5mg i.e. 0.0025g