Smiling is easier on the face than frowning. It takes 17 muscles to smile and 43 to frown.
Named for the patron saint of sailors, Saint Elmo’s fire is actually discharges of electricity that occur during storms. These discharges are seen as blue or bluish white lights at the tips of masts and bowsprits of ships at sea, as well as on church steeples and building spires on land.
The earliest era of geologic time is the Precambrian age. It began when the earth’s crust formed, 4.6 billion years ago, and ended with the dawn of the Cambrian period, 570 million years ago. About seven-eighths of earth’s history since the formation of the crust took place during the Precambrian age.
The Consumer Product Safety Commission reports that the five most dangerous sources are: stairs, glass doors, cutlery, glass bottles and jars, and home power tools.
The continental shelf is an underwater ledge around the coastline of the world’s oceans. The edge of the shelf lies at depths of between 360 and 480 feet. The width may vary from a few feet to several hundred miles.
Assuming that the heart beats at least once a second, by the time a person is 70, his or her heart will have beat at least 2.8 billion times.