The hominid lived between Africa, Europe and Asia between 2 million and 200,000 years ago about he was a great opportunist, expert in the collection of all kinds of roots, fruits, berries and tubers, eggs, invertebrates and in general small animals easy to capture including molluscs, turtles and small mammals.
One of the most common uses of primitive stone tools was to split bones to take marrow. Some researchers believe this was our specialty.
Just as the woodpecker specializes in extracting insects from tree trunks, the first humans specialized in extracting marrow from inside the bones.
Why the marrow?
Well, suppose the group of hominids are watching a herd of lions that land a giraffe and devour it.
They wait patiently until the lions and hyenas have finished their fill .
After that, with hands armed with stone blocks and sharp splinters they are able to break the long bones of large mammals , and to extract the marrow (one of the substances with the highest nutritional content).
Although scholar weapons are effective. there was never enough. But, against the relatively fragile building that is a submarine, a simple weapon can be as effective as a complicated weapon. This is what the Royal Air Force thought, which had requested, in 1938, a 40 mm automatic cannon for aircraft