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with a wall pattern so distinctive that palynologists can identify plant communities from sediment cores millions of years old

Pulmonologists

The trefoil is the simplest knot that cannot be reduced to a circle

West Nile virus has global reach

If you have ever solved a peptide structure

circle of Willis necklace | silver gold_plated with a wall pattern soCircle of Willis necklace sterling silver If you have trained on stroke protocols, you know the circle of Willis before you know most other brain anatomy. The arterial ring at the base of the brain that provides collateral perfusion when one vessel is blocked. Thomas Willis described it in 1664, and it remains the key to understanding why some strokes are catastrophic and others are survivable. The Science Behind the Circle of Willis The circle of