What was the life expectancy of our ancient ancestors? Detailed answer

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What was the life expectancy of our ancient ancestors? Detailed answer

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What was the life expectancy of our ancient ancestors?

In the Stone and Bronze Ages, judging by the remains of human skeletons, people over 50 years old were an extremely rare exception. The average life expectancy was 18-20 years.

In ancient Rome, a person at the age of 40 was called an old man, and at 60 years old - a dopontanus (a person suitable only for sacrifice). The average life expectancy in ancient Rome was 28-30 years.

It remained the same during the Renaissance.

Author: Kondrashov A.P.

Random interesting fact from the Great Encyclopedia:

What is the difference from a regular ballpoint pen for astronauts?

The first ballpoint pen was produced in the late thirties of the last century. It very quickly became the most common, cheapest and most convenient pen for everyone, and especially for schoolchildren and students. The most difficult thing was to come up with a composition suitable for writing with a ballpoint pen, because ordinary ink was not suitable for this - a special paste was needed, the composition of which was found by the Hungarian chemist Josef Biro.

Our country failed to acquire a patent for the production of ballpoint pens, so scientists had to look for the composition of the paste again. The production of tiny balls has long been established, but everyone could not make pasta. Flies helped, or rather, a means of dealing with them. In those days, a mixture of castor oil and rosin was used to fight flies in everyday life. And then one engineer of the Moscow factory of art paints suggested making a paste out of it. And what do you think? The pens stopped leaking and began to write!

The first Soviet ballpoint pen was made at the Soyuz plant in Leningrad in 1949, and mass production began in the 1960s. In 1969, special ballpoint pens were developed for astronauts. Having tested them in weightlessness, the cosmonauts of the Soyuz-4 and Soyuz-5 crews were very pleased with them. After all, ordinary ballpoint pens refuse to write, even if you attach a sheet to the wall, not to mention the ceiling. Under normal terrestrial conditions, the paste is fed to the writing ball under the action of gravity. In space, weightlessness. What did our designers come up with? A very simple and very reliable device is a cylindrical spring, with the help of which the paste is fed to the ball. She performed the role of earth's gravity in space. And so that the handle did not fly around the cabin, a special nylon thread was attached to it, twisted into a spring. At the end of the spring is a hook. They can attach the handle to the pile upholstery of the ship wherever you want.

Test your knowledge! Did you know...

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The computer reads minds 22.07.2008

A computer program developed by American scientists is able, based on the results of a brain scan, to determine what word a person is thinking about.

Researchers at Carnegie Mellon University led by Tom Mitchell suggested that the way the brain processes nouns depends on how they are related to verbs. "Hammer", for example, activates the areas of the brain associated with movement, "lock" - with spatial information.

Using these assumptions, Mitchell and his colleagues created a program that tried to account for semantic relationships. The program was tested on nine volunteers whose brains were scanned as they looked at cards with nouns written on them.

There were 60 of these words in total, and 58 of them were entered into a computer along with the corresponding maps of brain activity. Then the program analyzed the text, with a volume of 10 billion characters, and established links between the experimental words and the previously introduced 25 verbs. This was followed by a testing phase: the program was tasked with predicting the areas of the brain "responsible" for two missing words when entering. Three quarters of the answers were correct. The idea itself is not new: there is a model that guesses which of the 100 images a person sees.

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