What wood was the Kon-Tiki raft made of? Detailed answer

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What wood was the Kon-Tiki raft made of? Detailed answer

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What wood was the Kon-Tiki raft made of?

The Kon-Tiki raft, on which Thor Heyerdahl and his companions crossed the Pacific Ocean in 1947, was built from balsa (balsa) wood, common in the tropical rainforests of Central and South America.

The balsa tree easily renews on cuttings, grows quickly and reaches maturity by the age of 5. It has a light (lighter than cork in the dried state), very durable wood, used in aircraft construction as a sound and heat insulating material.

Since ancient times, rafts and dugout shuttles have been made from balsa tree trunks.

Author: Kondrashov A.P.

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Only amateurs can compete in the Olympic Games.

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Adults and children perceive time differently. 10.02.2023

It is well known that the perception of time changes with age, and now Hungarian researchers have been able to figure out why this happens.

The perception of time in children and adults is noticeably different: a forty-minute seminar is more likely to seem short to an adult, and for many first-graders, sitting out so much time in a lesson is a difficult test. Of course, the perception of time is influenced by many factors, from a person’s temperament to saturation with emotionally charged events, but researchers from the Etvos Loran University (Hungary) decided to study the influence of one of the main factors: the age of the subject.

The experiment involved 138 people divided into three groups: "preschoolers" (4-5 years old), "schoolchildren" (9-10 years old) and "adults" (18 years old and older). All participants were asked to watch a couple of videos lasting one minute: these were excerpts from a popular animated series, balanced in visual and acoustic richness, but differing in events.

One video was a mini-story (a cop rescues animals and arrests a thief), the other showed almost nothing (six people sailed away in a rowboat). Half of the subjects were asked to watch an "active" video first, and then a "monotonous" video, the other half - vice versa. At the end of the experiment, the participants were asked to answer the question: which video was longer?

The results were different for all three age groups: two-thirds of the "preschoolers" found the "active" video to be longer, while three-quarters of the "adults", on the contrary, said that the video about the policeman was shorter than the video about rowing. Judging by the results of the survey of "schoolchildren", the switch from "preschool" to "adult" perception of time occurs in children at the age of about seven years: "schoolchildren" also more often called the "monotonous" video longer, although they were not so clear on this issue like "adults".

To explain the difference in the perception of time between adults and children, the researchers turned to the concept of heuristics, a set of rules and methods for quickly making complex decisions that do not require much thought and calculation. In particular, for a small child, the more he can tell about the video he has watched, the longer it seems to him. Things are different with adults: growing up, we get acquainted with the concept of absolute time, but remain hostages of our own perception, when seconds stretch like chewing gum at a boring meeting, and when watching a fascinating movie, we forget to look at the clock.

Thus, acquaintance with the concept of absolute time, flowing at its own pace and being measured, changes the very perception of time in our brain: entering the adult world, children are forced to rebuild their perception of time, because now it is not they themselves, but the clock on their hand that determines the duration. one event or another.

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