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there are many modern appliances in everyday life. we can say that computer is one of them. it is rather useful for those who work or study. i’m sure before the computer was invented people didn’t even think about instant message exchange or about having documents in electronic format.
today, thanks to this square object with the monitor and keyboard, many tasks have become easier to solve. we wouldn’t be able to type our messages or essays without computer. in that sense, it is of great help when doing home work. for people working in various spheres computer is also helpful. some specialists even work from home nowadays. it involves teachers, accountants, psychologists, chefs, and even fitness instructors. they create a blog and fill it with lots of useful information: articles, videos, instructions, advice.
the bad side of the computer is in its damage to health. after spending hours in front of the monitors some people start to experience back problems. others find that their eye sight deteriorates. health specialists advice to do more physical exercise. while working on a computer for many hours, we need to make occasional breaks, take a walk in the park or do some household chores.
also, with the appearance of internet people see their friends less. they know that they can communicate with them through various online messengers or social networking. that’s why there is no need to leave the room or flat. this is obviously the drawback of our favourite home appliance. we are losing the delight of live communication. that’s why everything should be done in moderation and even computers should be used with wariness.
7)what did not work to make koch with this bacterium?
8)where koh then went to study?
9)what he found in dirty water on one of streets?
10)what conclusion did koch after the detection of bacteria in water?
11)what was the source of this disease?