I took the time to learn about the earth's crust and I was amazed that the most abundant element in the crust is oxygen. We certainly cannot see the oxygen, although geologist can deinfitely measure its prevalence. While learning the most abundant elements in the crust, I was even more flabbergasted that all of the most prevailing ingredients with the exception of aluminum and titanium, play critical roles in the human brain and immune system, and in near the exact porportions in which they are distributed in the crust. Oxygen, the most critical component of our existence, silica, and our skin nails, hair, bones, and then iron, our blood, and calcium and our mass in bone marrow, and then sodium and potassium, which is the fuling pump of every cell in our bodies, and magnesium and manganese, which are important ion channels in the brain, and muscular expansion/contraction in our bodies. I now believe that I am a bi-product of planet earth's crust and I no longer question how I got here, as I now know, thanks to science. Here is a pictorial representation of the spreadsheet that I made in Excel that summarizes the earth's crust components and their function in the body and brain.