The life of plastic

The life of plastic

Microplastics have been found in the placentas of unborn babies, the depths of the Mariana Trench, the summit of Everest, and the organs of Antarctic penguins. Here is the story of how plastic contaminates entire ecosystems – and even the food we eat.
Mars once wetter than thought

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

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.