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.
The cat that wouldn’t die

The cat that wouldn’t die

The weird paradox of Schrödinger’s cat has found a lasting popularity. What does it mean for the future of quantum physics?

Telescope finds promising hints of life on distant planet

Scientists have found new but tentative evidence that a world orbiting another star may be home to life. A Cambridge team studying the atmosphere of a planet called K2-18b has detected signs of molecules that on Earth are only produced by simple organisms.