NatureWhy Do Some Mushrooms Glow in the Dark?
Some fungi make their own light through bioluminescence. Learn how that differs from fluorescence and why a glowing log may not have glowing mushroom caps.
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Page 3 of 16 · Science, nature, space and history.
Nature
SpaceWhy Are Taurid Meteors Called Halloween Fireballs?
Taurid meteors can produce bright fireballs around Halloween and November. Learn what causes the display and when the two Taurid branches are active in 2026.
NatureWhy Are Blueberries Blue If Their Juice Isn’t?
Blueberries look blue because tiny structures in their natural wax coating scatter light. Discover why their juice does not have the same blue appearance.
SpaceCan a Planet Orbit Two Stars at Once?
Yes. Astronomers have confirmed planets that orbit a pair of stars, called circumbinary planets. Their changing starlight helps reveal the planets’ irregular transits.
SpaceHow Do Astronomers Find Rogue Planets Wandering Alone?
Rogue planets can be almost invisible because they do not orbit a bright star. Astronomers can find some when their gravity briefly magnifies light from a more distant star.
SpaceHow Do We Know Europa Has an Ocean Under Its Ice?
Europa’s ocean is hidden beneath ice, but its cracked surface, magnetic response and tidal heating offer several independent clues. Here is what the evidence shows—and what remains unconfirmed.
NatureCan Elephants Hear Messages Traveling Through the Ground?
Elephant rumbles travel through air and soil. Research suggests elephants can detect ground-borne vibrations, although exactly how they interpret these signals is still being studied.
NatureHow Do Glass Frogs Become Almost Transparent?
Glass frogs do not vanish like glass. When resting, they move most circulating red blood cells into their liver, making their underside more transparent for camouflage.
NatureHow Does Life Thrive Around Deep-Sea Hydrothermal Vents?
At deep-sea vents, microbes use chemical energy instead of sunlight. They support food webs around hot, mineral-rich fluids on the ocean floor.
NatureHow Do Mangrove Trees Survive in Salt Water?
Mangroves use several different strategies to limit salt stress, including filtering salt at the roots, excreting it through leaf glands and storing it in leaves they later shed.
ScienceHow Did the Giant Crystals in Mexico’s Naica Cave Grow?
Naica’s cave crystals grew in warm, mineral-rich water that stayed near the right temperature for a very long time. Slow growth and few new crystals let a small number become enormous.
ScienceWhy Do Earth’s Magnetic Poles Sometimes Flip?
Earth’s magnetic field has reversed many times, but not on a regular schedule. The shifting flow of molten iron in the outer core drives the changes.
ScienceWhy Do We Dream, and Does It Only Happen During REM Sleep?
Dreams can occur in REM and non-REM sleep. Brain activity helps explain why dreams can feel vivid, but scientists have not settled on one purpose for dreaming.
TechnologyHow Do Airbags Inflate So Quickly?
An airbag system detects crash conditions with sensors and sends an electrical signal to an inflator.
NatureHow Do Chameleons Change Color?
In panther chameleons, rapid changes in skin hue involve tiny guanine crystals inside specialized skin cells.
ScienceHow Can Lightning Turn Sand Into Glass?
Lightning can melt and fuse mineral grains along its path through the ground.
NatureHow Do Oysters Make Pearls?
Pearls form when a mollusk deposits shell-building material inside its body.
NatureWhy Do Deserts Get Cold at Night?
Many deserts cool sharply after sunset because the ground loses heat by infrared radiation while dry, often cloudless air returns comparatively little of that energy toward the surface.
ScienceWhy Do Oil and Water Separate?
Oil and water usually separate because a uniform mixture is not their favored state under ordinary conditions.
TechnologyWhy Do Rechargeable Batteries Lose Capacity?
Lithium-ion batteries gradually lose capacity because repeated use and time cause chemical and structural changes inside their cells.
ScienceWhy Do Seashells Sound Like the Ocean?
A shell held near your ear changes the background sound reaching you.
ScienceWhy Does Soap Remove Grease Better Than Water?
Soap helps water carry away oily dirt because its molecules contain two different regions: a water-compatible head and an oil-compatible tail.
SpaceWhy Does the Moon Always Show the Same Face?
The Moon keeps roughly the same hemisphere facing Earth because it rotates once in the time it takes to complete one orbit.
SpaceHow Are Exoplanets Discovered?
Most exoplanets are found indirectly by measuring how a star dims or wobbles. Learn how astronomers confirm candidates and what each method can reveal.