Invisible Questions
Christoph Wernli
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Recent Episodes
Egg at Altitude
To cook an egg at altitude, does it have to be boiled longer than at sea level? This episode in Italian: https://quesiti-invisibili.podigee.io/8-uovo-in-quota This episode in Swiss German:…
Standards
The world is full of standards. Why do we have the ones that we have, and do we deserve them? This episode in Italian: https://quesiti-invisibili.podigee.io/7-standard This episode in Swiss German:…
Aqueducts
The ancient Romans constructed aqueducts to overcome valleys. Why didn’t they just use pipes instead? This episode in Italian: https://quesiti-invisibili.podigee.io/6-acquedotti This episode in Swiss…
Power Lines
The electrical grid is made up of masts of different shapes that carry a variable number of power lines. What is the logic behind this variety? This episode in Italian:…
Mountains & Hills
Mountains are generally considered terrain elevations. But what distinguishes a mountain from a hill? And if an elevation is very close to the one next to it, when do they still belong to the same…
Cheese Eyes
Some hard cheeses are full of holes, commonly known as eyes. Where do these eyes come from, and why did they start to disappear in what has come to be known as the Great Eye Crisis? This episode in…
Horizontal Fish
Most fish are vertical, but some are horizontal. How come? This episode in Italian: https://quesiti-invisibili.podigee.io/2-pesci-orizzontali This episode in Swiss German:…
Italian Time
On most sundials, the meridian — the mark indicating the sun’s highest point in the sky — points to 12 o’clock. But sometimes, it points to a much later hour, between 4 and 8 p.m. How come? This…
Frequently Asked Questions
Invisible Questions has published 8 episodes since May 2025, covering topics in Science, Society & Culture.
Invisible Questions is currently moderate with new episodes every 2 weeks. Average episode length is 4m.
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