Colin Madsen, 25, enjoyed night-walking in Siberia but never came back after going out on Sunday.
Friends of missing American questioned using polygraph by police as search goes on for 25 year old student last seen early Sunday.
EU delegation targeted by activists, who say meeting is glossing over the truth and turning Russia into aggressors.
Scientists make crucial new discoveries of bacteria, up to 30 million years old.
Siberia's colossal resource potential is a great competitive advantage that needs to be skilfully deployed.
When Vadim Kolpakov went on an expedition to the north of Irkutsk region, he had no inkling of the sensational discovery he was about to make.
With smoke having blown as far as the US and Canada, experts now say 'the trend is positive' in controlling fires raging from the Urals to the Pacific.
He chose to become a hermit for six months on the shore of Lake Baikal in deep winter, miles from the nearest town and city.