Is there a scientific basis for blood donation?

This method was founded in the Three Kingdoms period and has always been recognized by the ancients as the only way to recognize relatives. No one doubts its authenticity. In ancient times, there were two ways to recognize relatives, one was to combine blood and the other was to drop bones.

The common method of combining blood on TV is to drop two people's blood into a vessel to see if the two drops of blood match. If they are married, it means they are related by blood. If not, it means they are not related by blood.

In fact, this method has no scientific basis. If the water temperature is low, two drops of blood will condense quickly when dripping, but they will not merge. On the contrary, if the temperature is high, the blood is easy to disperse and looks like it is fused together. There is also a bone drop method that is even more deceptive.

If a person dies with only bones left, the way to tell whether he is a relative or not is to drop blood on the bones. If bones absorb blood, it means they are related by blood. If blood passes through bones, they are irrelevant.

In fact, whether the bone is buried in the open air or in the soil, its soft tissue will rot and then dissolve and disappear, and the surface of the bone will become rotten and brittle. At this time, no matter what liquid can seep in, so this method is unscientific. In ancient times, through this method to recognize relatives, I don't know how many unjust cases have arisen, and I don't know how many fish have escaped from the net.