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2) when was the Stonehenge build?

Stonehenge was built between 3100 and 1500 BC

3)Where is a big UFO festival held every year?

a big UFO festival is held in Roswell, Usa

4) who have written The day of the Triffids?

it was written by John Wyndham

5)when was the coelacanth rediscovered? it was rediscovered in 1938

6) who found the Greenpeace? Bob Hunter found the Greenpeace