TechnologyHow Do Reusable Rockets Land Upright?
Reusable rocket boosters use carefully timed engine burns, aerodynamic control and landing legs to return to a planned spot. Here is how the sequence works.
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Page 2 of 16 · Science, nature, space and history.
Technology
TechnologyHow Does a Smoke Alarm Detect Smoke?
Smoke alarms use sensors to detect particles in air. Photoelectric alarms sense light scattering; ionization models detect changes in a tiny electrical current.
ScienceHow Does a Tsunami Warning System Detect a Wave?
Tsunami warning centers combine earthquake data, ocean sensors and forecast models to estimate whether dangerous waves are approaching a coast.
SpaceWhat Are Gravitational Waves? Ripples in Spacetime, Explained
Gravitational waves are tiny disturbances in spacetime produced by accelerating massive objects. Learn how mergers create them and how observatories detect the signal.
ScienceWhat Causes Déjà Vu? The Brain’s Familiarity Signal
Déjà vu is a brief feeling that a new moment is familiar. Researchers link it to memory and familiarity processes, but no single mechanism explains every episode.
ScienceWhat Is a Bomb Cyclone? The Weather Term Explained
A bomb cyclone is a midlatitude storm that intensifies rapidly as its central pressure falls. The name describes the rate of strengthening, not an explosion.
NatureWhat Is an Atmospheric River? A River of Moisture in the Sky
Atmospheric rivers are long, narrow corridors that transport water vapor. They can replenish water supplies, but strong or stalled systems can also bring flooding.
NatureWhat Is Lake-Effect Snow? Why One Town Can Get Buried
Lake-effect snow forms when cold air crosses comparatively warm, open lake water, picks up moisture and rises into narrow snow-producing bands.
ScienceWhat Is the Polar Vortex—and Does It Cause Cold Weather?
The polar vortex is a large circulation of cold air around each pole. It always exists; winter cold outbreaks happen when atmospheric patterns allow Arctic air to move south.
ScienceWhat Is Thundersnow? When a Snowstorm Makes Thunder
Thundersnow is a thunderstorm whose precipitation is snow. Strong rising air, instability and moisture can produce lightning inside an intense winter storm.
ScienceWhat Is Wind Chill? Does It Make Objects Colder?
Wind chill estimates how quickly wind and cold air remove heat from exposed skin. It changes perceived heat loss, not the thermometer reading of an inanimate object.
TechnologyWhy Does Airplane Turbulence Happen on Clear Days?
Turbulence is irregular air movement caused by weather fronts, mountains, storms or wind shear. It can occur in clear skies when nearby air moves at different speeds.
ScienceWhy Can’t Adults Remember Being Babies?
Most adults recall few or no events from infancy because autobiographical memory systems develop over childhood. Babies learn, but early memories are hard to retain and retrieve later.
ScienceWhy Does Time Seem to Speed Up as We Get Older?
Clock time does not change with age, but remembered time can feel faster as routines, attention, memories and personal expectations shape how we judge past periods.
ScienceWhy Does Motion Sickness Happen? Your Senses Disagree
Motion sickness can happen when the brain receives conflicting motion signals from the eyes, inner ear and body. Cars, boats, planes and VR can all trigger it.
ScienceWinter Weather Watch vs. Warning vs. Advisory: What’s the Difference?
A watch means conditions are favorable, a warning means a hazardous event is occurring or imminent, and an advisory signals less severe but disruptive conditions.
NatureCan Wild Turkeys Fly? Yes—And They Sleep in Trees
Wild turkeys can fly despite their heavy appearance. Learn how flight helps them escape and reach nighttime roosts, and why ground sightings are misleading.
NatureHow Does Zombie Fungus Control an Ant?
Zombie-ant fungi alter behavior and invade muscles. Discover what scientists observed, why the ant bites vegetation, and what remains unknown about the brain.
NatureWhat Are Frost Flowers, and How Does Ice Grow From a Stem?
Frost flowers are delicate ribbons of ice pushed from certain plant stems. Discover why freezing air, moist soil and a water supply must coincide.
SpaceWhat Causes the Leonid Meteor Shower Every November?
The Leonids come from debris left by comet 55P/Tempel-Tuttle. Learn why they return in November and why an annual shower is not always a meteor storm.
SpaceWhat Is a Supermoon, and When Is It in November 2026?
The November 2026 supermoon falls on November 24. Learn what perigee means, how much larger the Moon can look, and why it will not fill the sky.
NatureWhy Do Carved Pumpkins Rot So Fast?
Carving breaks a pumpkin’s protective surface, encourages moisture loss and gives decay organisms access. Learn why a jack-o’-lantern collapses so quickly.
ScienceWhy Do Clocks Fall Back in November? The 2026 U.S. Change
Clocks fall back on November 1, 2026, in U.S. areas observing daylight saving time. Learn why 1 a.m. repeats and why the change does not create daylight.
ScienceWhy Do Snowflakes Have Six Sides?
The sixfold pattern of many snow crystals comes from ice’s molecular structure. Learn why their branches differ and why not every snowflake is a perfect star.