What if Our Muscles Were Less Powerful?
As every medical student comes to learn when first dissecting the human body at medical school, our limbs are almost entirely composed of muscles.
Remarkably, Humans Are Just the Right Size to Make and Master Fire
Only an organism of our dimensions and android design — 1.5 to 2 meters in height with arms about 1 meter-long ending in manipulative tools — can handle fire.
How Man Became the Fire-Maker
Being terrestrial is one obvious requirement. No fully aquatic species could master fire and thus develop metallurgy.
The Path to Technology Was Built into Nature
All these elements of fitness in nature for the development of technology, crucial to mankind’s rise to civilization, long preceded man’s arrival on Earth.