Notes and References. 1  U.S. Senate: Reference Home > Glossary > Christmas tree bill. 2  Lardner, George (1966) The Day Congress Played Santa: A Look at the Christmas Tree Bill, Washington Post, 25 December, p. A1, A10. 3  Shribman, David (1983) It Began as a Rather Ordinary Piece of Legislation, New York Times, 9 November, p. A22.
When the individual is awake, blinking of the eyelid causes rheum to be washed away with tears via the nasolacrimal duct. The absence of this action during sleep, however, results in a small amount of dry rheum accumulating in corners of the eye, most notably in children.
Boogers are made of the mucus that lines the nostrils and, along with the tiny hairs known as cilia, protect the lungs from foreign objects such as germs, dust, dirt and pollen. Most of the time, the cilia trap these minute invaders, encapsulate them with mucus and move them out of the nose. Sometimes, however, this mucus becomes gummy and gelatinous -- or hard and crusty -- and forms what is known colloquially as a booger [source: Kids Health].