Why are pilots and airplane mechanics so meticulous in their upkeep and maintenance of aircraft? The fact that one critical misstep would spell disaster shows that anything that flies must have many interdependent parts that are all narrowly specified for flight.

Mercury, the closest planet to the sun, rotates so slowly that one day there lasts about 59 earth days. The planet has only three days in each of its years, and the sunny side is so hot that lead would easily melt on its surface.

How does a single-cell egg turn into a swimming, metabolizing, hunting tadpole? Common understanding holds that frog DNA carries the required instructional building plans. However, developmental biologists serendipitously discovered that tiny facial features were outlined with bioelectricity just prior to their formation inside frog eggs.