Burrow extension by crack propagation

Article Abstract:

Burrowers can progress through impeding, muddy, and cohesive sediments by using a mechanically efficient, previously unsuspected mechanism crack propagation in which an alternating anchor system of burrowing serves as a wedge to extend the crack-shaped burrow. The force required to propagate cracks through sediment in this way is relatively small.

United States, Burrowing animals, Homes and haunts, Sediments (Geology), Cracking (Materials)

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The reluctant celebrity

Article Abstract:

A reclusive Russian, Grigory 'Grisha' Perelman, claims to have proved a geometrization conjecture, a theory that is crucial for understanding the three-dimensional surfaces. Perelman's reaction to the acclaim generated by his work is discussed.

Models, Prediction (Logic), Dimensions, Dimensions (Measurement), Perelman, Grigory

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