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Former UK Prime Minster Tony Blair warns world leaders they may pay a heavy price in history if they fail to tackle global warming.

A mix of chemicals borrowed from plants with tiny tubes of carbon can spontaneously create tiny, self-repairing solar cells.

A group of Danish rocket enthusiasts trying to launch a dummy 30km into the sky abort the mission when a valve on their rocket freezes up.

The Hubble space telescope returns to view one of its favourite subjects - a giant stellar explosion first seen from Earth in 1987.

Israeli scientists believe they have identified why Arabic is particularly hard to learn to read.