CuriositiesWhy is the sea salty when rivers do not seem to be?
The explanation starts with rocks, travels through rivers and continues with processes in the ocean.
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Curiosities
Stories, explanations and fresh perspectives that make the everyday worth a second look.
Curiosities
CuriositiesWhy do we see lightning before hearing thunder?
The flash and sound come from the same phenomenon but reach our senses at different speeds.
CuriositiesWhat makes bread dough rise?
Fermentation, gas and dough structure help explain the transformation that happens before bread reaches the oven.
CuriositiesWhy does popcorn pop?
A small kernel contains water, starch and a structure that holds pressure until the transformation we hear in the pan.
CuriositiesWhy do shadows change length during the day?
The Sun’s apparent position changes the direction and length of shadows. A simple observation makes the geometry easier to see.
CuriositiesSoap bubbles: why does the film tend to enclose air in a sphere?
Surface tension helps explain a familiar shape. Notice what changes when bubbles are free, attached or touching one another.