Curly hair is a natural defense against the summer heat. Free Technical Library News

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Curly hair is a natural defense against the summer heat.

29.06.2023

Scientists from the University of Southern California (USA) found that people with curly hair tolerate heat better.

The researchers conducted a series of laboratory experiments on a human head model. While maintaining a temperature of 35 °C, corresponding to the warmth of the scalp, they irradiated the model with a heat lamp. The model had different types of hair: straight, slightly curly, very curly, as well as a model with a completely bald head. The skin was either dry or moist.

The results showed that thick curls provide the best protection from the sun. Under them, the artificial skin almost did not heat up. Scientists believe that our ancestors in Africa survived, including thanks to their curls: under the burning sun, thick curls helped ancient people retain water in the body longer.

"The results of the study do not surprise me. Curls protect the head not only from the scorching sun, but also from the cold. In addition, the scalp is better ventilated. Nowadays, in the summer, this is an ideal image not only for women, but also for men. curls, can consider himself lucky,” says stylist Maurice Klostermann from Berlin.

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Crystal is 1,6 times stronger and harder than diamond 17.06.2021

American researchers have created a lonsdaleite crystal that is 58% stronger and harder than regular diamond.

Diamond has good optical properties, high thermal conductivity and is the hardest natural material on our planet. It is commonly used in various cutting devices, drills and other abrasive processing tools. However, now scientists have been able to create and study in the laboratory a fairly large sample of a material called lonsdaleite - a hexagonal polymorph of diamond with a denser arrangement of carbon atoms.

To obtain it, the research team used a shock compression method, shooting a small diamond with graphite disks the size of a coin. With the help of compressed gas and gunpowder, the shells were accelerated to an incredible speed of 24 km / h. Colliding with diamond, they created powerful shock waves that compress the crystal structure to lonsdaleite.

At this time, scientists directed small sound waves at the sample and tracked their movement through the material using lasers. The speed of sound movement depends on the density (or rigidity) of the medium in which it moves. After analyzing the data obtained during the experiments, the team determined that lonsdaleite is 58% stronger than diamond, which is the highest among all materials known today.

However, do not expect this modification to become available in the near future. The problem is that in the lab, the ultra-strong form of diamond lasted only a fraction of a second before the crystal was shattered by the enormous impact force of the graphite disk. Therefore, in the future, researchers will look for a way to obtain stable samples.

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