The Attacks of the Goths on the Roman Empire. It is ironic that the most serious threats to the Roman Empire began not with the western Germanic tribes of the Roman frontier but the eastern Germanic tribes, particularly the Goths.
In a large, shallow body of water, hundreds of flamingos congregate like an avian water ballet team: all preening their pink feathers, resting in the sun and standing on one leg for hours at a time. Flamingos even sleep that way. Bird Image Gallery.
They are not floating; rather, they are supported by the surface of the liquid. (a) An insect leg dents the water surface. F ST is a restoring force (surface tension) parallel to the surface. (b) An iron needle similarly dents a water surface until the restoring force (surface tension) grows to equal its weight.