Why is Friday the 13th considered an unlucky day? Detailed answer

BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
Free library / Directory / Big encyclopedia for children and adults

Why is Friday the 13th considered an unlucky day? Detailed answer

Big encyclopedia for children and adults

Directory / Big encyclopedia. Questions for quiz and self-education

Did you know?

Why is Friday the 13th considered an unlucky day?

This superstition has biblical roots. On Friday, the serpent tempted Eve, forced her to eat the forbidden fruit from the tree of the knowledge of good and evil. On Friday, the Savior, Jesus Christ, was crucified on the cross. The last time 13 people were present at the Last Supper, it was the 13th, Judas, who betrayed the Savior.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

What is the fastest mammal on earth?

Man can move on the ground much faster than any other mammal... but not at the expense of his own legs! Even the fastest runner of our time can seem very slow compared to some animals.

A person can run at speeds up to 35 kilometers per hour. But even such a slow animal as an elephant or a rhinoceros can reach speeds of up to 40 kilometers per hour.

A racehorse, which is considered a fairly fast animal, can run at speeds up to 80 kilometers per hour. The fastest greyhound can race at a speed of about 60 kilometers per hour.

If we want to know the true speed of a mammal, then we need to think about animals such as antelopes and gazelles. These animals can reach speeds of up to 100 kilometers per hour. But the speed champion of the animal kingdom is the cheetah. The speed of this animal exceeds 110 kilometers per hour! Of course, they can maintain this speed for a distance not exceeding one mile, after which they switch to a slower speed.

Test your knowledge! Did you know...

▪ What is blood pressure?

▪ What is Sisyphean labor?

▪ Who ranks second after the US in terms of revenue from agricultural exports?

See other articles Section Big encyclopedia. Questions for quiz and self-education.

Read and write useful comments on this article.

<< Back

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. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive

Waterproof keyboard from Logitech 11.07.2013

In the summer, you will have to look for ways to escape from the summer heat. As always, air conditioners, fans, and, of course, plenty of drink should help us with this. Unfortunately, no one canceled the work, which means that most of the time your drinks will be dangerously close to the computer. One careless move, and now your keyboard is completely filled with sweet juice, coffee or plain water. As sad experience shows, it is unlikely to work yet.

However, not all keyboards are so vulnerable to external influences. The Logitech Washable Keyboard K310 doesn't just stand up to "pouring", it can be washed like dishes - under running water and with a cleaning agent. This can be useful in cases where simple dust removal is not enough. The keyboard can be washed over and over and even submerged under water to a depth of 28 centimeters (except for the USB cable). Convenient water drain holes on the back of the case allow you to quickly dry the device.

Modern ergonomic design and standard sizes make the device durable and comfortable, and look great in your workplace. The Logitech Washable Keyboard K310 has a numeric keypad and a set of F-buttons. To launch frequently used applications with just one touch of a finger - the keyboard has an additional twelve hot keys for instant access to the Internet, e-mail and sound control.

Other interesting news:

▪ Instead of paper books - electronic

▪ Microscopic metacars running on light

▪ Skoda virtual dashboard

▪ This sweet word is meteorite

▪ NEC: the world's first HD-DVD drive

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Experiments in chemistry. Article selection

▪ article In the old days, grandfathers lived more cheerfully than their grandchildren. Popular expression

▪ article In what animals can a severed limb try to feed the former owner? Detailed answer

▪ article Pruning of crowns of trees growing along communication lines. Standard instruction on labor protection

▪ article Theory: 3H preamplifiers. Encyclopedia of radio electronics and electrical engineering

▪ article Spiral UHF antenna. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews