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Reversibility and Its Limits
At the microscopic level, physics runs equally well forward and backward; the film of colliding particles looks lawful in reverse.
Stories by Mahendra
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Landauer’s Principle: The Energy Cost of Forgetting
Erasing a bit of information is not free.
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The Second Law: Why Time Has a Direction
Among physical laws one stands apart for caring about direction.
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Entropy and the Arrow of Time
The laws of physics look the same run forward or backward, yet time plainly flows one way.
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Conservation Laws and What They Forbid
Some quantities never change, whatever else does.
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Symmetry: The Deep Economy of Physics
That the laws of nature look the same from different viewpoints is no mere elegance.
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Renormalization: Seeing Across Scales
To understand a system one need not track every detail.
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Phase Transitions: Matter Changing Kind
Cool water and at a precise point it becomes ice, its character transformed.
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Percolation: The Sudden Onset of Connection
Add links to a scattered set of nodes and for a long while little changes.