Previously acting editor of BBC Earth, environment news editor for New Scientist. I mostly write about life sciences and the environment
The secret of how life on Earth began
The answer to one of the biggest questions of all
Could we store carbon dioxide as liquid lakes under the sea?
We need to get carbon dioxide out of the atmosphere to slow down climate change, and perhaps deep-sea trenches would be a good place to put it
Huge space rocks could have helped start Earth’s plate tectonics
Nobody knows how or why plate tectonics got started on Earth, but it may have been triggered by staggeringly violent impacts from space rocks.
Antarctic mystery microbe could tell us where viruses came from
Viruses are not like other organisms and nobody is quite sure where they originated, but a newly discovered single-celled organism seems to offer a clue
The BBC should stop giving unwarranted airtime to Nigel Lawson
The broadcaster had tough questions for Al Gore and then gave space to false claims of a prominent climate sceptic. This is a recipe for spreading misinformation
The push for UK fracking may be 55 million years too late
The UK’s shale gas revolution has begun, but it might fizzle out almost immediately
The physics that tells us what the Universe is made of
The building blocks of the cosmos
Why you should mostly trust what science tells you
Even though scientists sometimes make mistakes
Why bother saving endangered species?
It will cost billions of dollars. Is there anything in it for us?
The 25 biggest turning points in Earth's history
From leaps forward in evolution to devastating asteroid impacts, these were the milestones that shaped our world
The future may be set in stone
Physics suggests that the future has already happened
Why the sky is dark at night
It may seem obvious, but the dark sky tells us a lot about the Universe
What did the Big Bang look like?
It was the birth of our entire Universe
Earth probably has more than one moon a lot of the time
We all know about the Moon, but not the other one
Why the New Horizons flyby of Pluto is so amazing
We are all gazing at an entirely new world