Gravity mysteries: Why does gravity only pull?
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Issue 2712
A double whammy of disease and bleaching has changed the face of reefs in the Caribbean
People had better stop smoking – but we should welcome healthier options for those who don't
All the other forces in nature have opposites – so what makes gravity different?
This week's Feedback reveals the oldest physicist in the world and explains why Hollywood's next big biopic won't be about Bernard Madoff. Plus: enter our new competition to win a piece of rock from the moon…