Wasps against ticks. Free Technical Library News

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Wasps against ticks

05.02.2006

German biologists from the Agricultural University in Hohenheim have found a natural enemy of ticks that carry dangerous diseases. It is a small, two-millimeter wasp, Lariophagus distinguendus, which lays eggs in ticks.

After a few days, the hatching larvae eat the tick almost entirely. Entomologists believe that it is possible to arrange the breeding of beneficial wasps and their release in places of mass reproduction of ticks.

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Accelerated learning of new languages enlarges the brain 19.10.2012

At the Swedish Academy of Military Translators, young recruits are forced to learn new languages at a very fast pace. By examining the brain before and after learning, a group of researchers was able to observe what happens to it during the period when we learn a new language in a short period.

Young people who participated in the experiment and who have a talent for learning foreign languages were given the task of mastering an unfamiliar and complex language, such as Arabic, Russian or Dari, in 13 months. From morning to evening, seven days a week, recruits intensively studied the language at a strenuous pace.

As a control group, the scientists used students from Umeå Medical University - these students also actively studied, but not languages. Both groups underwent MRI before and after the three-month study period. While the brain structure of the control group remained unchanged, certain parts of the brains of the language learners grew. In particular, the growth affected the hippocampus, a deep brain structure involved in the study of new materials and spatial navigation. Three areas of the cerebral cortex also changed. The students who had more growth in the hippocampus and superior temporal gyrus had better language skills compared to others. The students who exerted more effort than the others showed growth in the middle frontal gyrus.

"We were surprised to see that different parts of the brain were developed to varying degrees depending on how well students performed on tasks and how much effort they had to put in," says Johan Mortensson, a researcher at the University of Lund, Sweden.

Earlier studies by other groups have shown that Alzheimer's disease occurs later in speakers of two or more languages. Thus, we can conclude that learning a language is a great way to keep your brain in shape.

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