Why a puffy cloud can have such a straight bottom
Follow warm air upward to see how condensation creates a roughly level cloud base—and how drier air helps shape the fluffy edges above it.
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How corals build thriving reefs in nutrient-poor water
Coral animals share their tissues with sunlight-powered partners. Follow the exchange to see how it supports reef growth—and what bleaching interrupts.
Free reads
Your receipt is not the economy.
One basket, many lives. Why an inflation number can be accurate and still feel unfamiliar.
A skyline, drawn by gravity.
The Gateway Arch turns a hanging curve into a standing monument.
The eleven days nobody lived.
In Britain, 2 September 1752 was followed by 14 September. Time continued. The labels changed.
Breakfast has an internal structure.
The white threads in an egg are not a mistake. They are part of the design.
The room became the instrument.
Four minutes, thirty-three seconds, and a different way to listen.
The map that stopped being literal.
Harry Beck made London easier to navigate by making its geography less accurate.