Big Think

How does a soccer field get striped turf? Some types of mowers are equipped with a roller that flattens the grass in the direction of travel during mowing. If the grass is flattened away from the spectator, he can see the planes of grass reflecting the light. If the lawn is flattened towards the viewer, it appears dark because you can see mainly the tops of the grass, which have a small reflection area, and the shadows cast by the grass. It is mowed by moving alternately in opposite directions.

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What affects the number of dots on a ladybug? The number of dots, their shape and location are a species feature of ladybugs. Many of them are called so - two-pointed, seven-pointed... Normally, they are black dots on a red or yellow background. But there are also "negative" forms with red spots on a black background.

Why are energy drinks harmful? The experiment showed that under the influence of energy drinks the reaction rate increases, but the ability to hold this high concentration decreases. After a few energy drinks, the brain reaction slows down and becomes lower than before taking them. At the same time, the heart beats like mad and the blood pressure rises considerably: all the symptoms of caffeine overdose. It should be noted that in France, Denmark and Norway, energy drinks are sold only in pharmacies, by appointment of a doctor. And in Germany, not only the sale in general, but even the production is banned.

What is the difference between zucchini and squash? Zucchini is a type of squash The common squash, according to botanical classification, is a subspecies of the common pumpkin, and the zucchini is simply a variety of squash. Different varieties of zucchini were bred in Italy in the late XIX century. Zucchini differs from squash in color (green or striped), thinner rind and higher vitamin C content.

Whose words scrawled on the surface of the tractor were found to be legally binding? Wills are generally notarized by a notary or other authorized person, but handwritten wills drawn up without witnesses are also legally valid. For this, experts after the death of the testator must acknowledge that he was acting in his right mind and memory, and no one else could have written the document. In 1948 the Canadian farmer Cecil Harris, working in the fields, was crushed by an overturned tractor and managed to scrawl on the wing: "If I die, I leave everything to my wife". Lawyers analyzed this detail and declared the will legitimate.

Why does whipping turn milk into butter? The microbubbles of fat fuse with each other Physically, milk is an emulsion - a suspension in water of tiny milk fat bubbles surrounded by a thin layer of surfactants. Shaking or even vibration causes these bubbles to merge into large droplets. The droplets float to the surface and form butter, a substance consisting of fat with a mixture of water, proteins, and other substances.

Why do we get heatstroke? All processes in our body are accompanied by heat production. Even a 60-70 kg person lying motionless produces about 1600 kcal of heat per day, and the more the air is colder, the more intense the heat is transmitted to the surrounding air. If the air is only one or two degrees colder than the body, the heat is poorly dissipated and the body overheats. Heatstroke can also be caused by localized exposure. When a person with an uncovered head is under the blazing sun, it can heat the scalp to a higher temperature than the air. And if the overheating takes over the brain, heat stroke will occur. On the other hand, if the air is dry, a person can avoid overheating even at temperatures above 36.6 °C by sweating.

Can you refuse food in a restaurant and not pay if you haven't try it? Unless there is a good reason to refuse food - sawdust, cockroaches, hair, etc. - no, you can't. Catering company provides, attention, the Catering service (!) That is, if there are no complaints about the service, it is considered fulfilled - the food is spent, the cooks worked on the service and performed it qualitatively, you got the service - and you are obliged to pay for it, according to the price tag.

Why are the windows in an airplane round? In the early 1950s, the de Havilland company produced an airplane called the Comet. An airplane that was considered a true marvel of aviation. A year later, however, it broke into pieces right in the air. A few months later, a similar thing happened to two more planes. Engineers diagnosed every cog in the plane and found the problem. The cause of the crash turned out to be the plane's windows - they were square. The fact is that the corners of the windows have a heavy load, which is even stronger during the flight. The engineers solved the problem by rounding the corners of the windows. Thanks to this, it is now much safer to fly.