Every morning, it rises golden on the horizon, shines bright white at noon, then sets in a festival of reds and oranges. This great celestial actor, the Sun, changes color before our eyes throughout ...

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COLORADO, USA — Autumn is one of the most beautiful times to live in Colorado. Hillsides turn stunning shades of gold, orange and red. Sometimes it seems to happen almost overnight. Leaves change ...

You might expect a sexual partner to disclose a sexually transmitted infection. But you can’t rely on this – and criminalising the spread doesn’t work. For the first time, an emissions and climate ...