How genetically similar are we to one another?

we are 99.99% similar to each other in DNA wise however that 0.1 makes all of us different which includes our background, the foods we eat, the environment we are raised in and etc.  

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.