Ever since Charles Darwin, scientists have assumed species facing the same problem often evolve similar traits. But that’s ...

Streamlining is based on the naturally efficient shapes of fish and birds. Streamlined objects, with their curved, tapered shapes, offer less resistance to air, water, or any other fluid they pass ...

Image caption, Some shapes, known as streamlined shapes, cause less resistance than others. Aeroplanes and cars are streamlined, so that they move through the air as easily as possible.