The cause of collapse of many societies of the past is complex.
Memories of the past glories survive in mankind minds.
Overshadowed by the remains of dinosaurs and hominids, the Cambrian period fossils tell the story of a revolution in evolution that sheds light into our ultimate origins.
Finding extra-terrestrial life on Mars would be celebrated as one of the most important events of the last decades. It would also mean that we are probably doomed.
In his successful fight against lead gasoline, Clair Patterson showed us how scientists can become an essential element in the defence of our rights and wellbeing.
How a group of climate change sceptics running the scenes in Washington could make this fight an uphill battle