A Mrs. Kristy L. France, Cardiology (Cardiovascular Disease), answered on behalf of Honor Society of Nursing (STTI). The blood type of a child depends on the blood type of the parents. Each parent/person has two genes that make up the blood type. Depending on which combination each parent has determines the different combinations that the child can have.
The use of bands and chains are mentioned on the Powerlift Assistance Exercises pages. This page will describe their use. The use of bands and chains are especially recommended for those who compete using squat and deadlifts suits and a bench shirt. The bands and chains mimic the effects that the gear gives and provide extra work for the top part of each lift.
No, it isn't the same thin as cutting. It's actually a very different thing. People often use the rubber band around the wrist idea as sort of a reinforcement. For instance, say someone is trying to stop a bad habit, when they think about the habit or start to do the habit, they snap the band. It kind of trains the mind to relate the habit to the stinging so that it will reduce the thoughts.