All Stories
- Earth
Scientists Say: Sundog
A sundog appears in the sky when sunlight shines through tiny ice crystals suspended in the air.
- Animals
To clear loops, Sonic the Hedgehog must hit the right speed
Most animals don’t run through loops. Sonic would need the physics behind roller coasters and race cars to clear one.
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As the climate warms, polar bears are facing more germs
Polar bears have been exposed to more viruses, bacteria and parasites in recent decades, a new study shows. These may come from their diet.
- Space
Microscopic black holes may be flying through our solar system
These flybys could jostle the orbits of planets and satellites as teeny black holes whiz by us once a decade or so.
- Animals
Giant rat border agents could help put a stop to wildlife poaching
African giant pouched rats have been trained to ferret out elephant ivory, pangolin scales and more. They could be put to work preventing smuggling.
- Plants
Catapulting pollen helps this flower beat out its rivals
With explosive blasts of pollen, male Hypenia macrantha flowers remove rival pollen from hummingbird beaks before the birds reach female flowers.
- Chemistry
Scientists Say: Rocket propellants
Rockets need more than fuel to get where they need to go — they also need oxidizers to burn that fuel. Together, these chemical combos are known as rocket propellants.
- Chemistry
Experiment: What makes ice melt fastest?
During the winter, you might have seen trucks spreading a mix of salt and sand on the roads to de-ice them. But how does that work? Let’s investigate.
- Microbes
New type of division can split this microbe into 14 cells at once
The newfound strategy seen in C. matruchotii might help oral bacteria recover lost territory after each eviction by toothbrushing.
- Plants
Are plants intelligent? It seems to depend on how you define it
Plants can do a lot of the same things animals do: communicate, learn — even remember. Now scientists want to know if that means they’re intelligent.
- Fossils
Analyze This: How big was the biggest T. rex?
Only around 80 fossil Tyrannosaurus rex skeletons have been found. They probably don’t include the biggest T. rex that ever lived.
- Archaeology
Let’s learn about ancient pyramids
You may have heard of pyramids built in ancient Egypt — but what about ones built elsewhere in Africa, Europe and the Americas?
