air conditioning energy outdoor heat climate feedback

Air conditioning can add to warming

People use air conditioning to adapt to warmer conditions, but it uses energy and releases heat outdoors. Both can contribute to the warming it helps people cope with.

Some Islamic art has depicted Muhammad

Persian miniature paintings showed him from at least the 13th century, though views varied across regions and groups. Under the Safavids, artists began covering his face; images remained available in Iran and Turkey, while they could offend Muslims elsewhere.

A spinning black hole can give away some of its energy

A spinning black hole twists the space around it. In a region just outside the black hole, an object can enter and then escape with more energy than it had before. That extra energy comes from the black hole’s spin.

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air conditioning energy outdoor heat climate feedback

Air conditioning can add to warming

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