Why do mosquito bites cause itching? Detailed answer

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Why do mosquito bites cause itching? Detailed answer

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Why do mosquito bites cause itching?

Have you ever heard that females are more bloodthirsty than males? This is especially true for mosquitoes. Only females suck blood. The beak of the female has a small sharp piercing organ located around the suction tube. When a mosquito bites, it releases a poisonous liquid into the blood. This poison causes pain, itching and swelling.

In addition to bites, the buzzing of mosquitoes is very annoying. However, this is very important for mosquitoes. This is a kind of comradely call. The male emits a deep low squeak, rapidly vibrating his wings, and the female takes these shrill notes.

Mosquitoes live all over the world. But wherever they are, all species begin their life in the water. The female lays eggs on the surface of water bodies, in puddles and even in cans, usually from 40 to 400 pieces. They can be located either in a heap or individually.

A week later, small legless larvae hatch. They are very active in the water. Since they cannot breathe underwater, they spend a lot of time on the surface. Here they take in air through the breathing tube on the tail, feed on the remains of animals and plants. They put them in their mouths with the help of fluffs that are on their heads.

Growing up, the larvae change or shed their skin. The fourth time they molt, turning into a chrysalis. The pupa spends most of its time near the surface, breathing through horny tubes on its back. The chrysalis does not eat, but after a few days she sheds her skin and a mosquito appears.

An adult mosquito usually only lives for a few weeks. In one year, some species have time to change 12 generations.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Who are the Neanderthals?

To understand how human development took place, scientists carefully study everything that remains of primitive people: tools of labor and hunting, dishes, skeletons, etc. In 1856, the remains of several people. So for the first time the skeletons of primitive people were discovered, preserved entirely due to the fact that the ancient inhabitants of the caves buried their dead. As you might guess, they were called Neanderthals in honor of the Neanderthal area, where their remains were found.

Scientists hypothesize that Neanderthals lived for about 70 years in Central Asia, the Middle East and many regions of Europe. They appeared on Earth about 000 years ago.

What did a typical Neanderthal look like? He was a strong, stocky man. His face was very different from the face of a modern person: flat cheekbones, a heavy, far protruding jaw, a low forehead and an almost absent chin - such is the portrait of a normal Neanderthal. It is possible that early Neanderthals lived outdoors during the warming period between ice ages.

However, after a new cold snap, they moved under the arches of the caves and learned to fight the cold. Many hearths found in caves prove that these people used fire to keep them warm and protect them from predators. It is also very likely that they cooked food on it.

Neanderthals knew how to make not only hand axes, but also flint tools. The latter were wide fragments of stones with well-honed edges. Some of them were in the form of irregular triangles and, apparently, were used as knives for skinning and cutting the meat of slaughtered animals.

It is possible that Neanderthal hunters also had wooden spears pointed at the end. And, finally, one very interesting detail about the Neanderthals: their brains were larger than the brains of modern humans!

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Plextor M7e SSD 13.01.2015

At the Consumer Electronics Show 2015, Plextor showcased the all-new M7e SSD, which uses the M.2 form factor and PCI Express 2.0 x4 interface, delivering a major performance improvement over the current generation M6e SSD.

While Plextor SSDs are renowned for their reliability and high read/write speeds even after extended use, last year's Plextor M6e is by no means a performance champion. The reason for this was the use of the PCI Express 2.0 x2 interface, which has a maximum bandwidth of about 1 GB / s. However, its successor, the Plextor M7e, will use a PCIe 2.0 x4 interface with up to 2 GB/s bandwidth, which means it will raise the bar.

The Plextor M7e SSD is based on the Marvell 88SS9293 controller and Toshiba's 19nm Multi-Level (MLC) NAND flash memory. In addition, the Plextor M7e will be equipped with power failure protection technology, further enhancing the manufacturer's already legendary SSD reliability.

While Plextor is still working on firmware for the M7e, the latest SSD is already showing significantly better performance than its predecessor. According to CrystalMark, the sequential read speed of the novelty is 1.4 GB / s, and the write speed is about 1 GB / s. Thus, the new Plextor M7e outperforms the Samsung XP941, which is used by many expensive laptops, such as the Apple MacBook Pro.

Plextor plans to release the M7e drive in M.2 form factor with PCIe 2.0 x4 interface. To ensure compatibility with current platforms, Plextor will ship with the new SSD and a special adapter, a small HHHL size card that plugs into a PCI Express 2.0 x4 (x8, x16, etc.) slot. Plextor did the same with the M6e, which can be used in both an M.2 slot and a PCI Express slot.

Plextor is expected to release the M7e SSDs in 256GB, 512GB and 1TB capacities in the second quarter of 2015. Considering the high read and write speeds, as well as a range of Plextor's proprietary technologies, M7e devices could become quite popular SSDs this year. The cost of new products is unknown, but taking into account the simplicity of the design of these drives, I would like to believe that their prices will not be excessively high.

The appearance on the market of the very similar Kingston HyperX Predator PCIe and Plextor M7e will inevitably intensify competition among PCI Express 2.0 x4 SSDs, as well as high-performance drives in the M.2 form factor. As a result, the availability of new SSDs may become higher.

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Given the fact that back in August last year, Marvell introduced the 88SS1093 controller, which supports four PCI Express 3.0 lanes (maximum bandwidth of about 4 GB / s) and can provide even higher write and read speeds, by the middle of the year it is logical to expect more faster M.2 SSDs with PCIe 3.0 x4 interface.

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