Dog star: Scientist recalls training Laika for space

"I asked her to forgive us and I even cried as I stroked her for the last time," says 90-year-old Russian biologist Adilya Kotovskaya, recalling the day she bid farewell to her charge Laika.

Lessons of Chernobyl disaster, 30 years on

Ukraine next week marks the 30th anniversary of the Chernobyl disaster, when human error and flawed Soviet reactor technology led to the world's worst nuclear accident.

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