Seaweeds showing off their drag reducing skills.
Littered with the dehydrating corpses of seaweeds, beaches after a big storm are a reminder that life can be tough out there in the crashing waves. But seaweeds aren’t totally defenseless. A recent study in the American Journal of Botany studied two different strategies that seaweeds use to reduce drag so that fast-moving waves don’t uproot them.
Drag is proportional to the total area of the seaweed multiplied by drag coefficient, which depends on the seaweed’s shape. (For example, a boxy school bus has a higher drag coefficient than a race car.) That means seaweeds can either get smaller or more streamlined to ride out the waves.