Animals
As the tropics warm, some birds are shrinking
Migratory birds are getting smaller as temperatures climb, studies had showed. New evidence shows dozens of tropical, nonmigratory species are, too.
MS-LS1-5
Construct a scientific explanation based on evidence for how environmental and genetic factors influence the growth of organisms.
More Stories in MS-LS1-5
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Health & MedicineGender-affirming care improves the mental health of transgender youth
Several states have tried to restrict access to gender-affirming health care for transgender youth. That goes against medical guidelines.
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Health & MedicineA single vape session can harm immune cells in the body
Vaping creates molecules in the body that can attack cells and cause damage.
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Health & MedicineStarting schools later leads to less tardiness, fewer ‘zombies’
Students attending schools with later start times feel more awake during the day and are less likely to oversleep and be late for class.
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AnimalsLet’s learn about elephants
Check out five wild facts you may not know about a familiar animal: the elephant.
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Health & MedicineCannabis may alter a teen’s developing brain
Marijuana use between ages 14 and 19 was linked to faster thinning of brain regions important in decision-making.
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MicrobesLet’s learn about microbes
There may be a billion species of microorganisms on Earth — but scientists have only discovered a small fraction of them.
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MicrobesSeveral plant-like algae can morph into animal-like predators
Single-celled green algae swim through water as free cells. Most use only photosynthesis for their energy. But not all of them, a new study shows.
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PlantsScientists may have finally found how catnip repels insects
The plant deters mosquitoes and fruit flies by triggering a chemical receptor that, in some animals, senses pain and itch.
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BrainTeen depression linked to how the brain processes rewards
Depression in teens alters their brains’ pathways in ways that may put those kids at risk of lifelong mental-health problems — unless they get help.