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Converting atmospheric carbon dioxide into batteries

Foregone conclusions – the Kruskal count

Stop walking up escalators for better efficiency

3D printing objects with sensors in them in one go

Could dark matter not exist?

80bola and Google's proxy problem

Can anything curb the dominance of the internet's big guns?

Dyson investing in battery tech to try to double battery life

Britain's last lion tamer gets his chin nibbled. Photo gallery

How men and women name colours differently

How we come to know ourselves in the age of the Quantified Self