Science Explained
Why Is the Sky Blue but a Sunset Red?
The afternoon sky and the evening glow are two views of the same interaction between sunlight and air. The difference is the route the light takes.
Science
Science Explained
Why Do Some Materials Conduct Electricity and Others Don’t?
A cable works because its metal centre and plastic covering behave differently. The important distinction is whether electric charges can move through the material.
Science Explained
Why Can’t We Feel Earth Spinning?
Earth carries us around its axis every day. The reason that motion feels so ordinary has more to do with acceleration and shared motion than with speed alone.
Science Explained
How Can an Airplane Stay in the Sky?
A heavy aircraft stays airborne because its wings change the motion and pressure of the air around them. One popular classroom explanation leaves out the crucial part.
Science Explained
How Do Fireflies Produce Light Without Getting Hot?
A firefly's lantern is a chemical light source, not a miniature flame. Its glow turns energy into a signal that other fireflies can read.
Science Explained
How Do Scientists Know How Old a Fossil Is?
A fossil rarely arrives with a date stamped on it. Scientists combine its position in the rocks with natural radioactive clocks to reconstruct when it lived.
Science Explained
Why Does Ice Float When Most Solids Sink?
An ice cube’s familiar position at the top of a drink comes from an unusual molecular arrangement—and helps explain how lakes survive winter.
Science Explained
How Can a Ship Made of Steel Float?
A steel nail sinks, yet a steel ship carries thousands of tonnes. The water responds to the whole vessel's shape and displacement, not just the material in its hull.
Science Explained
Why Does Your Voice Change When You Breathe Helium?
The familiar squeaky effect mainly changes the resonances that shape a voice. It reveals the difference between the sound your vocal folds produce and the sound your mouth broadcasts.