科学研究   慢速英语

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And every five to seven years,the batteries that supply power must be changed.This requires another operation.Dr. Marban says the devices are not right for all patients.And others are too sick to use ...

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A woman paralyzed from the neck down has learned to use her thoughts to control a specially-designed motorized arm.The arm is the product of years of research on mind-controlled artificial limbs.Resea...

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The World Health Organization says iron deficiency is the most-common micronutrient disorder worldwide.WHO officials also say iron deficiency is a leading cause of anemia.About two billion people suff...

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Not long ago,many people believed that babies only wanted foodand to be kept warm and dry.Some people thought babies were not able to learn things until they were five or six months old.But doctors in...

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Sleeping sickness cannot be prevented by a vaccine or medicine. So to avoid the disease, a person must avoid the tsetse fly. Avoiding the fly can be simple. Wearing thick clothes that cover the skin p...

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Maman Louise lives in the city of Nkayi in western Congo. During a civil war in her country, she had to leave her home. She stayed in the forest for two years. During this time, she started acting str...

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Each month was 30 days.Then, they divided each day into 24 equal parts,or hours.They divided each hour into 60 minutes,and each minute into 60 seconds.Humans have used many devices to measure time.The...

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“[Instead of] excelling physically outdoors, I stay in and think creatively. I write music and come up with program ideas. I use my mind [instead of] my body.” There is no cure for Sickle Cell Anem...