What is the best time of day to study? Detailed answer

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What is the best time of day to study? Detailed answer

Big encyclopedia for children and adults

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

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What is the best time of day to study?

The best time to study is in the evening, as closer to the night the brain begins to work most intensively. At least that's what Australian scientists think.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

When was the key first made?

The ancient Egyptians were the first to use something like a key to lock doors. They locked the doors with a wooden bolt inserted into the groove. A movable wooden pin, known as a tumbler, was attached to the top of the groove. When the deadbolt was in place, a wooden tumbler was lowered into a hole cut in the deadbolt. The bolt firmly locked the door, and in order to move it, it was necessary to lift it with the key and pull the toggle switch out of it.

The first key looked completely different from the modern one. It looked more like a huge toothbrush with pegs instead of bristles at one end. When the key fell into the groove, the pegs fit under the toggle switch. When the key moved up, the toggle switch was pulled out of the bolt, which then easily moved away. The key of the Egyptians could only be used on the side of the door where the bolt was.

The Greeks discovered a way to move the bolt from the back of the door. They pushed the key into a hole above the bolt until its end reached a notch in the bolt, which was inside a twisted plate, which, in size and shape, resembled a peasant's sickle. Some of these keys were over a meter long and were worn over the shoulder.

Later, the ancient Romans became the most skilled locksmiths. They greatly improved them, and improved the keys. The teeth at the end of the Roman keys had a different shape. Nowadays, in order to forge a key, one must take into account not only the correct position of the teeth and their correct length, but also the correct shape. The Romans invented small locks that could be moved from place to place. We call these padlocks. Padlock keys were usually made in the shape of a ring. They could be worn on the finger.

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Smart lamps will help you find goods in the store 04.03.2014

Philips has come up with the idea of "smart lighting" to help the shopper find their way in a large supermarket. The idea is based on Visual Light Communications technology, similar to Li-Fi (light and fidelity), in which light plays the role of an information carrier.

The Philips development differs from others similar in that its implementation does not require the use of photosensors that "communicate" with the lamps. Only the front camera of the smartphone is used. Currently, the new development is already being tested in several stores, and is also being demonstrated at the Euroshop.

To help customers in large stores, Philips offers to equip them with lamps of its own production. The lamps are controllable and are able to very accurately determine the location of the buyer, interacting with the application installed on the smartphone. The application can show the path to the desired products, or offer discounted products located exactly in the department where the buyer is currently located. Over time, with the help of such an application, it will be possible to track the preferences of buyers. Another "ability" of the application - it can guide the buyer through the list of products needed for a particular dish.

Of course, this form of navigation can only be relevant in giant supermarkets, where an unprepared buyer spends quite a lot of time searching for the necessary goods. According to Philips, no additional equipment is needed from either the buyer or the store owner to implement the idea. By comparison, Apple's proprietary iBeacon positioning technology requires the installation of many transmitters, since it is based on the Bluetooth Low Energy (BLE) interface.

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