Does it take more energy to skip or run to the pizza restaurant?
Our readers tell questioner Jessica, age 5, that it is definitely more efficient to run to the restaurant - and encourage her to keep up the exercise!
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This week鈥檚 new questions
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Mind
What becomes of the broken-hearted? 51动漫s investigate
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Tom Gauld ponders how to communicate with extraterrestrials
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Twisteddoodles on a new way to come up with research ideas
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Environment
Photos of an island paradise reveal plastic threat for bird population
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Space
Get ready to watch the dazzling Perseid meteor shower in August
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Why do some flowers close up at night but others stay open?
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How do you check the accuracy of an atomic clock?
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This week鈥檚 new questions
When cycling on hilly roads, what is the best option to save energy: go as fast as possible downhill to gain momentum for the next climb, or stop pedalling to have a rest and regain some strength? And, is it feasible to start a fire with a fart and a static spark from human hair?
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Can we live on worms alone? Probably not, find scientists
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Tom Gauld on how to invent a subatomic particle
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Twisteddoodles suggests a way to prevent catastrophe
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How a spot of coral cosplay helped put marine pollution on the map
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