Here, we’ll explain how a typical bird wing functions ... downstroke so they’re pushing down against the air with every flap. If you take a cross-section view, the upper surface is curved ...

A colossal solar filament over twice the distance between Earth and the moon erupted from the Sun's northern hemisphere ...

Some birds are true aerial acrobats. They glide effortlessly through the sky without flapping their wings constantly. Discover the top birds that ... them a commanding view of their territory.