Soviet scientists were authorised to carry out experiments that required the reactor to be pushed to or beyond its limits, with safety features disabled.

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The spacecraft would carry out experiments from a vantage point about 1.5 million kilometres from the Earth where there is an uninterrupted view of the Sun.

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Traditionally research chemists carry out four experiments a day, mixing chemicals in bucketlike containers.

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The researchers now plan to carry out further experiments to test this.

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The aim is to carry out conversation experiments between humans and robots in space, speaking with Japanese astronaut Koichi Wakata in his native tongue.

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However, the team only have permission to carry out the lab experiments and as yet this would not be allowed to be offered as a treatment.

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He told jurors how he had been interested in chemistry since schooldays and kept chemicals at home to carry out "classic textbook experiments".

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The crew will carry out a series of scientific experiments, including geophysical studies to predict earthquakes and volcano eruptions.

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