Where is the largest textbook? Detailed answer

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Where is the largest textbook? Detailed answer

Big encyclopedia for children and adults

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Did you know?

Where is the largest textbook?

In one of the libraries in Vienna. There you can see this human-sized anatomy textbook: height 1,90 m, width 0,9 m. It was printed in 1830 in Vienna.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

What percentage of our brain do we use?

100%.

Or 3%.

It is generally accepted that a person uses only 10% of his brain. Which invariably leads to discussions about what each of us would achieve if he managed to use the remaining 90%.

In fact, at one time or another, a person uses his entire brain. On the other hand, recently published work by Peter Penny of the Neural Science Center at New York University indicates that, ideally, the human brain should not "fire" more than three percent of neurons at the same time - otherwise the energy needed to "recharge" each of the neurons after the "volley", it turns out to be so powerful that our brain is simply not able to cope with it.

The human central nervous system consists of the spinal cord and brain and is represented by two types of cells: neurons and glial cells.

Neurons are the main processors of information: they receive input signals and send output signals. The input signal enters the neuron through tree-like dendrites, and the output signal is sent along cable-like axons.

Each neuron contains up to 10 dendrites, but only one axon. An axon can be thousands of times longer than the tiny cell body of a neuron. The longest axons are in giraffes: their length can reach 000 m.

The area of contact between axons and dendrites is called the synapse. This is where electrical impulses are converted into chemical signals. Synapses are something like toggle switches that connect neurons to each other and turn our brain into an interconnected network.

Glial cells, or gliocytes, provide the scaffolding of the brain: they control neurons and act as brain cleaners, "sweeping" debris after neurons die. There are fifty times more gliocytes in the human brain than neurons.

In total, one human brain contains five million kilometers of axons, one quadrillion (1) synapses, and up to 000 billion neurons. If neurons could be arranged side by side, they would cover an area of 000 square meters. m, or four football fields. The number of ways in which information is exchanged in the human brain is greater than in the universe of atoms. With such astonishing potential - no matter what percentage of the brain you and I use - all of us, no doubt, could be a little more useful.

Test your knowledge! Did you know...

▪ How did the Paricutin volcano in Mexico get its name?

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▪ What literary character Dumas was invented only to increase the fee?

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