1.Human handnails grow ten times faster than toe nails.
2. The full form of HB in pencil is hard block.
3.Human has four chambered heart.
4.Blood is composed of Plasma and blood corpucles i.e.RBC,WBC and platelets.
5.Every human has 5.5L of blood.
6.New RBC's are formed in every 3 months.Preence of this makes blood red in colour which is due to the presence of hemoglobin.
7.WBC's have no colour.These are resistance of body and irregular in shape.
8.Platelets are smaller in size and helps in blood clotting.
9.Our body has 206 bones.
10.The longest bone is in our thigh.
11.There are 46 pair of chromosome in a gene.
12.The pupil of the eye is the only organ which don't grow in our entire life.
13.Our nails and hairs are made of dead cells called Keratin.
14.Every person has different genes.
15.Fingerprint of one person doesn't match with other.
