From Al Jazerra, a video on thousands of people gathering at Egypt's Tahrir Square. Protesters are calling for a million people to file into the square. The Egyptian army and police have withdrawn from the area.
Better sleep, improved health, happier people: how ‘cool roofs’ could help
millions avoid deadly heat
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A project to measure how reflective paint reduces indoor temperatures is
delivering tangible benefits across Africa
The brick house Sylvia shares in a We...
13 hours ago
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