Mars once wetter than thought
Thousands of miles of ancient riverbeds have been discovered in the heavily cratered southern highlands of Mars, suggesting the red planet was once a far wetter world than scientists thought.
The enchanted car park
Once a hangout for sex workers and drug addicts, a parking lot in Medellín, Colombia, has been reborn as a green haven for all. We meet the ‘social urbanists’ credited with reducing crime – and even temperatures.
How humanity is losing the night sky
Losing the dark isn’t just about the stars. It has dire consequence for human health as well as the natural world.