Of the approximately 400 billion packages used yearly in the United States, half are for food and drink.

Extracted from flaxseed, linseed oil is the principal source of drying oil for paint and varnish.

Feudal society depended on the existence of faithful vassals.

City taxes are based on an estimate of the value of one's property.

If one aids and abets a criminal, he is also considered guilty of the crime.

In the past, energy sources were thought to be boundless.

Some scientists have argued that the purpose of the human appendix may have been to digest uncooked meat and bark, functions that are no longer useful.

Crop irrigation has long played a role in agricultural practices.

In the early 1960's many Southern communities were slow to desegregate their public schools.

Fragments of the Dead Sea Scrolls have been found in recent years.