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A Cloud of Hope and Danger
In 2050, a small cloud floats through the air in a hospital operating room(手术室). In the room a patient, suffering from cancer, lies on a table. The cloud surrounds (包围) the patient,her body and filling her lungs (肺). The cloud is not smoke or steam. It is made of millions of microscopic robots called nano-robots(纳米机器人). These tiny robots move from cell(细胞) to cell in thebody, destroying the cancer cells.
Fighting cancer with nano-robots is only an idea today,scientists say that it would be possible in the future. Using nano-robots for good purposes such as fighting disease or repairing the environment may be theto many of today's problems.
However, nano-robots could be arisk as well. Since nano-robots are so tiny, they will have to work in large teams of many thousands to 'many millions. For this reason, nano robots will have to be programmed to build. Scientists will not have the ability to build millions of nano-robots one by one.
Thisto reproduce(复制)is making some scientists worried. What if something goes wrong in the programming? Quite a lot of crazy nan-orobots would be farthan any disease. Some people think that if they get out of control, nan-orobots could destroy the Earth.
What should be done? Should we continuenan-orobots or should we search for other methods? This is one of the many difficultthat we have to make in the future.
