Animals
Traces from nuclear-weapons tests offer clues to whale sharks’ ages
Traces left by nuclear-bomb testing in the 1950s and ‘60s can help researchers learn how old a whale shark is.
HS-PS1-8
Develop models to illustrate the changes in the composition of the nucleus of the atom and the energy released during the processes of fission, fusion, and radioactive decay.
More Stories in HS-PS1-8
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EarthExplainer: Where fossil fuels come from
Despite one oil company famously using an Apatosaurus as its logo, oil, gas and coal don’t come from dinosaurs. They do, however, come from a long time ago.
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PlanetsHow Earth got its moon
How did our moon form? Scientists are still debating the answer. It may be the result of some one big impact with Earth — or perhaps many small ones.
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Scientists consider how to visit the closest exoplanet
Even at only a little more than four light-years away, a trip to our closest exo-world could take some tens of thousands of years — unless we’re willing to settle for virtual visits.
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ArchaeologyThe first farmers were two groups, not one
The humans that began farming 10,000 years ago in the Fertile Crescent may have been two cultures living side-by-side.
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EarthHelium discovery blows away shortage worries
Fears that the world may soon run out of helium have been set aside for now by the finding of a huge reservoir of the gas in East Africa.
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ArchaeologyNeandertals: Ancient Stone Age builders had tech skills
Neandertals built stalagmite circles in a French cave 176,500 years ago. These structures show that these ancient human cousins had social and technical skills.
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ChemistryDwarf galaxy spawned heavy elements
A study of nine stars in the dwarf galaxy Reticulum II found heavy elements. They had been produced after a violent stellar event sparked a chemical chain reaction.