Latest posts
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How Do Tornadoes Form?
A tornado needs warm humid air, cool dry air above it and wind that changes direction with height. When those line up inside a thunderstorm, rotation can reach the ground.
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Why Do We Sneeze?
A sneeze is a reflex that forcefully clears the nasal passages. It is triggered by irritation, and occasionally by bright light or a full stomach.
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Why Do We Get Goosebumps?
Goosebumps are a reflex inherited from furrier ancestors. The muscle that raises hair is still there, even though the effect no longer does much for us.
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What Is Dark Matter?
Galaxies rotate far too fast for the matter we can see. Dark matter is the name for whatever extra mass is holding them together, and we still do not know what it is.
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What Is a Tsunami?
A tsunami is not a tall wave at sea — it is a very long wave that only becomes tall when it reaches shallow water. That is why it arrives so differently from a storm wave.
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How Does Anesthesia Work?
General anesthesia produces unconsciousness, immobility, pain relief and amnesia — four separate effects that different drugs contribute in different proportions.
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How Do Antibiotics Work?
Antibiotics kill bacteria by attacking structures human cells do not have. That selectivity is why they work — and why they do nothing against viruses.
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How Does a Submarine Work?
A submarine controls buoyancy rather than depth directly. By taking on or expelling water it changes its weight while keeping its volume fixed.