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Mice are small but far from harmless creatures. In villages and towns, they are unpopular because they ruin grain harvests: if they get into a barn, some of the supplies can easily be thrown out. They also carry dangerous diseases, including the plague. In the Middle Ages, Europe suffered from it, thanks to mice.
Every year, with the arrival of summer, in addition to the pleasant hassle, comes the problem of pesky mosquitoes. Supermarket shelves fill with new mosquito repellents. The insects adapt, and the remedy that was a panacea last season suddenly stops working. What's left to do then? Perhaps we should turn to physics instead of chemistry? Modern inventions—ultrasonic repellents—have been created to save humanity from this mosquito scourge.
Even the most meticulous person can encounter bed bugs. They enter our homes on other people's clothes, crawl in from neighbors, or are brought in with new furniture or other purchases. These nasty insects cause a lot of trouble. People with sensitive skin, such as women and children, are especially vulnerable to bed bug bites.