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What people used three-dimensional maps carved from wood? Detailed answer

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What people used three-dimensional maps carved from wood?

The Inuit of Greenland, even before contact with Europeans, used three-dimensional maps of the coastline, carved from wood. They could be used by touch while kayaking at any time of the day. If the Inuit sailed at night, he determined the distance to the rocky shores by the echo of his voice, and then checked the curves of the wooden map.

Authors: Jimmy Wales, Larry Sanger

 Random interesting fact from the Great Encyclopedia:

What units are used to measure cosmic distances?

Light years, i.e., the distance that light travels in a whole year (more precisely, in 365,24 days). This is slightly more than 9460528404879 358,8126 m (exactly).

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Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

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Random news from the Archive

Wheat breeding has led to a decrease in its resistance 02.01.2019

Food security is largely determined by the yield of major crops. Climate change leads to changes in the weather, and, as a result, the variability of the harvest and food prices, and hence their availability. Uncertainty that food will be affordable causes waves of migration and political instability. To date, breeding methods can ensure a sufficient level of wheat yield in the current climatic conditions, but the climate is changing and many popular varieties may become underproductive.

Helena Kahiluoto of the Lappeenranta University of Technology and colleagues from other European universities analyzed wheat yield data from nine countries - Finland, Denmark, Germany, Belgium, the Czech Republic, France, Slovakia, Italy and Spain. The full data set consisted of almost 11 thousand numbers - the amount of wheat harvested per hectare, to which data on temperature, humidity, time and other parameters were compared. The scientists used data from 991 varieties of winter, spring and durum wheat grown between 1991 and 2014 in 636 locations in nine countries, as well as weather data from their growing areas in eight countries. At the first stage of the study, scientists chose climate change factors that have the greatest impact on crops (humidity, minimum temperatures at different times of the year, temperature changes). They then quantified the impact of climatic factors on crop yields.

The reason for the poor adaptation of plants to climate change, according to scientists, is a decrease in genetic diversity. Selection in favor of a few desired characteristics of the culture impoverishes the gene pool due to the disappearance of screened alleles. The genetic diversity of wheat began to decline after the 1990s. Researchers attribute this decline to an increase in the number of small-scale wheat producers. Increasing competition forced us to shorten the production cycle without wasting time on technological improvements.

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