A few interesting

How to easily move the weight?.

Has ever visiting the country in the East, or Africa, hit the ease with which local people are on the head pretty weighty cargo. Women of Kenya's Luo tribe, for example, can carry the load, equal to almost 70% of their body weight.

Research physiologists argue that carrying heavy loads on their heads - the most cost-effective for the human body. A confirmation of this can serve as the laws of physics, in fact, moving the load at a constant speed on a horizontal surface, a person commits a little work, except expended to overcome friction.

And that it was accomplished, it is necessary either to carry the load with the acceleration, or raise it. The last option occurs when walking, when the human body rises and falls. So the main force spent on lifting the body and the load at each step. Head with rises and falls with a lower vertical amplitude than the whole body. Moreover, this feature is elaborated in an evolutionary way: the brain protected against shocks, springs also served as a spring with a double bend of the spine. Although, of course, an important role in carrying goods on their heads is training that produces to the same beautiful and smooth gait. Although people who are not familiar with this method, the transport of goods, such experiments is better not to put on a.

Why do we fly in a dream?.

According to experts, ethologists ( they are studying hereditary forms of animal behavior ), dreams related to flying - it's one of the earliest manifestations of genetic programs, written in memory of mankind.

Approximately 25 million. years ago, our common ape-like ancestors with Gibbons owned brachiation - ability, swinging arms, fly from branch to branch. The man was ordained a different path of development, and Gibbons continued to improve in their flights and have achieved impressive results: their rapid jumps can not exceed 10 meters. The remaining humanoid ( gorillas, chimpanzees, orangutans ), and in fact we, the people have retained only the ability to climb trees.

On the ability of our ancestors to brachiation resemble not only the night ... Kinship with monkeys, brachiate ... The human hand is certainly a very complex manipulator, it can carry a fine jeweler's work, but the simplest and oldest of its function - to transform into a hook from a bent finger to grab the branch. In such a hook can hang even physically immature people. Children also have this ability almost from the first days of life. Pull a kid hands, and he immediately hooked to your fingers, so much so fast that it can safely lift. Perhaps the thought of flying ancestors in the crowns of tropical forest will brighten any inconvenience during our visits to crowded public transport, when we hang on ...

Most likely, came from the distant past to our children love to swing and, of course, to swing. From the same and known to everybody 's nightmare - a fall of. But for brachiate miss and break - a very real nightmare.