Health
Hans Christian Gram: The biologist who helped investigate bacteria
Biologist Hans Christian Gram devised one of the most important staining techniques used in microbiology to identify bacteria under a microscope
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Technology
Make a remote-control pest-proof bird feeder 鈥� part 2
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Does a large meal make you tired, and if so, why?
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Does nuking hurricanes mean Trump is declaring war on climate change?
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Humans
Dean Burnett on why disruptive teens might have saved the human race
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Environment
Can we create new land to save the fragile Mississippi delta?
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Technology
How to make a remote-controlled pest-proof bird feeder
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A road made of solar panels seemed like a good idea. Now it’s broken
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What is the carbon payback period for a wind turbine?
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How can a tree reabsorb its own branch?
One reader explains the events that lead to a tree reabsorbing its own branches
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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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