A ring has been included in wedding ceremonies since the 12th century. Pope Innocent the Third ordained that marriages had to take place in church and that a wedding ring should be exchanged during the service.

The United States Department of Agriculture reported that in 1997, half of U.S. farm production came from only 2% of farms.

The first automobile was created on 29 January 1886, when Carl Benz patented a tricycle with a one horizontal cylinder engine that he designed and built.

The average Polar Bear stands about 8ft tall.

Fata Morgana are visions in which landforms that are beyond the horizon appear to float above it in an inverted form.

After about 1,000 million years of exclusively bacterial life on Earth, perhaps the most important and dramatic event in the history of life took place - the origin of the eukaryotes. Eukaryotes differ strikingly from prokaryotes by the possession of a nucleus surrounded by a membrane and containing individual chromosomes.

The idea that molecules have three dimensional shapes dates back to Louis Pasteur, whose deduction in 1844 arose from the fact that solutions of two chemical compounds with identical composition could nevertheless twist a beam of light in opposite directions.

Satellites that carry many of our phone calls and live television programs are stationed about 22,240 miles away.

The cliffs on Uranus's moon Miranda are 20,000 metres high.