George Casey

The Serengeti is a huge area of grassland in Tanzania, Africa. Once a year, in the time of drought, about two million herd animals like antelopes travel north to feed and mate before moving south again, when plants there begin to ...

Volcanoes, earthquakes, and tornadoes all can cause enormous damage, and predicting where and when they will strike is of great importance. Volcanologist Dr. Marie Edmonds has devised sensors that monitor the underground activity ...