Massive Siberian source of diamonds formed by an asteroid 35 million years ago can 'overturn entire world gem market'.

This is the clearest evidence that our ancestors speared and killed the extinct giant.

Or is it a specially invented weapon to destroy Western food imports in retaliation for sanctions? 

Pipes are built over bulging and unstable Arctic pingos prone to violent eruptions caused by 'thawing methane gas', as seen twice on the Yamal peninsula this year.

A meteor? A rocket? A military missile? An UFO? So far no explanation for the lightshow over Trans-Baikal.

Flash seen over thousands of kilometres but scientists disagree over the cause.

Here we go back in time and remember 13 remarkable moments of 2013.

Whisky proves popular in the land of vodka.

Startling evidence on climate change links warming and cooling between the Arctic and Antarctic.

DNA of a fossil tooth found in the Altai Mountains shows early man and his best friend were together 19,000 years earlier than previously understood.