Brake in the egg. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Brake in the egg. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

In this experiment, two phenomena can be observed at once: inertia, experiments with which will be described later, and friction.

Hang a raw egg on a thin cord. To prevent the string from slipping off the vertically placed egg, use adhesive tape by sticking small pieces of it on the places where the string is located.

Hang a hard-boiled egg nearby. Twist each string with the egg in one direction for the same number of turns. When the laces are twisted, release the eggs at the same time. You will see that a boiled egg behaves differently than a raw one: it spins much faster.

In a raw egg, its protein and yolk try to remain stationary (this is their inertia) and, by their friction against the shell, slow down its rotation. In a boiled egg, the protein and yolk are no longer liquid substances and, together with the shell, seem to be one whole, so there is no braking and the egg rotates faster.

This experiment can be done without hanging the eggs: just twist them with your fingers on a large plate.

It is even more interesting to do such an experiment. Take two identical saucepans with two ears (you can also use toys). Connect the ears with a rope or thin wire, and tie another rope to the middle so that the pan is in balance. Hang both pots on these ropes and pour water into one of them, and the same amount of cereal in the other. Now twist the ropes the same number of turns and release. The result will be similar to the experiment with eggs.

When the pans have spun, try to quickly stop them, and then release them again. It turns out that the pot of water continues to rotate. Well, how can you explain this phenomenon?

Author: Rabiza F.V.

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Found an important difference between the human brain and other primates 01.09.2022

Scientists from Yale American University compared the activity of genes in the cells of the cerebral cortex in humans and other primate species. This made it possible to reveal a lot in common between them - and several important differences that can be key for the formation and operation of the human brain. Among these differences are microglial cells, which use the FOXP2 gene, which is important for language.

Biologists led by Nenad Sestan investigated the structures of the dorsolateral anterior cortex (dlPFC) - an area closely associated with the work of language and emotions, short-term memory, decision making and other higher cognitive functions of the brain.

dlPFC tissues from four primate species, humans, chimpanzees, macaques, and marmosets, were used. For each of them, scientists have identified a transcript - a complete set of RNA synthesized from active genes, showing which ones work in each particular cell. Thus, the authors obtained more than 600 transcriptomes for various primate species, after which they compared them with each other.

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