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Scientists warn that the heat-trapping effect of contrail clouds could triple by 2050 if no action is taken to curb aircraft emissions (Credit: Getty Images)
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Should we be avoiding contrails?

By Jocelyn Timperley

Ham and pineapple pizza (Credit: Iamnoonmai/Getty images)
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A pizza topping that divides the world
By Stephen Dowling and Richard Gray
Most creatures start ageing and eventually die after they reach sexual maturity - but why? (Credit: Fernando Trabanco Fotografía/Getty Images)
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Why do we die?
By William Park
After a few minutes in warm water, the skin on our fingertips wrinkles like a shrivelled prune (Credit: Neil Juggins/Alamy)
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Why your fingers wrinkle in the bath
By Richard Gray
Mount Everest is steadily growing taller at around 4mm per year while the forces of erosion wear away it (Credit: Alamy)
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How tall can Mount Everest grow?
By Harriet Constable
Cat being stroked (Credit: Getty Images)
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Why do we think cats are unfriendly?
By Stephen Dowling
Scientists have a number of theories for why zebra have evolved their distinctive black and white stripes (Credit: Getty Images)
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The truth about zebra stripes
By Yao-Hua Law
Sloth hanging from tree (Credit: Getty Images)
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Why do sloths move so slowly?
By Stephen Dowling
Mosquito feeding (Credit: Getty Images)
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Do mosquitoes get drunk?
By Stephen Dowling
Coffee machine filling cup (Credit: Getty Images)
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How do you decaffeinate coffee?
By Stephen Dowling
Cat Archie sleeping (Credit: Marjan Debevere)
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Why do cats purr?
By Stephen Dowling