Physics
Why some icicles become scallops not spikes
The newfound — and at times quirky — shapes reflect the density of water surrounding submerged ice.
HS-PS1-5
Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.
More Stories in HS-PS1-5
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PhysicsThe exotic ‘atom’ positronium surprises scientists
New measurements of a weird but simple atom, one without a nucleus, suggest it may have unexpected properties. Scientists find this troubling.
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ChemistryBuild ice towers with bottled water and ice
Pour out liquid water into a solid ice tower. We outline the conditions you’ll need to turn this demonstration into a super-cool experiment.
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ChemistryThis tube worm’s glowing slime may help sustain its own shine
Snot oozed by a marine tube worm can glow for up to 3 full days. The secret of how this works might lead to long-lasting lights that glow on and on.
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TechCOVID-19 victims could breathe easier with these innovations
Feared equipment shortages due to the COVID-19 pandemic have prompted research teams to develop novel technologies to help oxygen-starved lungs.
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ChemistryRock Candy Science 2: No such thing as too much sugar
Making rock candy at home takes a lot more sugar than you might think. Why? This experiment will show you why.
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ChemistryBanana plant extract can slow how fast ice cream melts
Food scientists now show that adding these tiny plant particles to ice cream may delay the rate at which this treat melts into a soupy mess.
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ChemistryScientists Say: Catalyst
Sometimes a chemical reaction can take a while. If speed is needed, a catalyst can help.
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EnvironmentTrees can make summer ozone levels much worse
The greenery can release chemicals into the air that react with combustion pollutants to make ozone. And trees release more of those chemicals where it gets really hot, a new study finds.
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EarthAncient Arctic ‘gas’ melt triggered enormous seafloor explosions
Methane explosions 12,000 years ago left huge craters in bedrock on the Arctic seafloor. Scientists worry more could be on the way today as Earth’s ice sheets melt.