1. Human fingers can sense a vibration with a movement of  0.02  mm.

2. Red blood cells are produced at a rate of more than 1 million per second and survives only 120 days.

3. In his life time , an average person eats about 40, 000  kg of food.

4. The body has 100, 000 km of blood vessels.

5. In a life time an average person breathes in about 420, 000 m3 of air.

6. We begin life as an ovum approximately the size of the full stop at the end of this sentence.

7. People sleep less as they grow older. A baby sleeps around 16 hours. A person above 60 need to sleep around 7 hours.

ABOUT YOUR BONES

1. A new  born baby has 350 bones and the adult only 206. As the person grows many bones are fused.

2. The smallest bone in the body is the stirrup in the ear. It is 2.6- 3.4 mm.

3. The longest bone is the femur ( thigh bone) which may be as long as 50 cm.

ABOUT YOUR HEART

1. The heart is not located against the left side of the chest. It is placed almost in the center but it is tipped slightly and so appears to be in the left side.

2. The heart beats 100, 000 times a day and about 35 million times a year without taking holiday. During an average life time , it will beat more than 2.5 billion times.

3. In an average life time the heart will have pumped about 200 million liters of blood.

4. In case of children the resting pulse rate ranges from 90-120 beats per minute which slows to 72 beats per minute in adults.

5. The 5.6 liters of blood in our bodies circulate three times through every minute. In one day, the blood travels about 19, 000 km  i.e. four times the distance across the USA from coast to coast.

ABOUT YOUR EYES

1. The naked eye can see upto 2.2 million years i.e. the distance of the Andromeda Galaxy.

2. It can see the flame of a match from 80 km.

3. It can become 2500 times more sensitive to  light after it has been exposed to a total darkness about 40 minutes.

4. It can detect 10 million different colour surfaces.

5. It can judge relative position with an arc of 3 to 5 seconds.