blood types

blood types

there are 8 diffrent types of blood in the world they are o-, o+, a+, a-, b+, b- & the rarest rypes of blood are ab- & ab+. they can be useful in many ways knowing someones blood type because they can get blood transfusions or if some ones blood is found at a crime scene they just have to find which blood type then find a know killer etc...

Finger Prints

Fingerprint ridges are formed during the third to fourth month of fetal development. The ridges begin to develop on the skin of the thumbs and fingers.No two prints have ever been found to be exactly alike. Even those of identical twins are different.Fingerprints are not inherited. The general pattern may be the same in families but the level 2 and 3 details will differ.