What is the carbon payback period for a wind turbine?
How long does it take to pay back the energy and resources used to make a wind turbine, and are they worth building? Our readers have the answers
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How can a tree reabsorb its own branch?
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This week鈥檚 new questions
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Mind
What makes us addicts? Judith Grisel is determined to find out
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Space
How a Soviet space station became a symbol of space cooperation
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Earth
Inside the powerful fire clouds that pack a volcanic punch
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How much do you know about the world?
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Technology
Make a weather station with BBC micro:bits and a sensor
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The ‘sexy’ lichen that puts lead in your pencil, but not in a good way
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How does water hydrate us?
Readers explain why we get thirsty and how our bodies control water levels with great accuracy
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Why do dogs and horses roll on their backs when happy?
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This week鈥檚 new questions
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Technology
Your DNA could transfer to a weapon you have never touched
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Technology
Satellite image captures a hyperconnected English Channel at work
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