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"Visible light" redirects here. For light that cannot be seen with human eye, see Electromagnetic radiation. For other uses, see Light (disambiguation) and Visible light (disambiguation)

Sadness is an emotional pain associated with, or characterized by, feelings of disadvantage, loss, despair, grief, helplessness, disappointment and sorrow. An individual experiencing sadness may become quiet or lethargic, and withdraw themselves from others. An example of severe sadness is depression. Crying can be an indication of sadness.

This article is about the domestic dog. For related species known as "dogs", see Canidae. For other uses, see Dog (disambiguation).

Sand is a naturally occurring granular material composed of finely divided rock and mineral particles. It is defined by size, being finer than gravel and coarser than silt. Sand can also refer to a textural class of soil or soil type; i.e., a soil containing more than 85 percent sand-sized particles by mass .

A hand is a prehensile, multi-fingered appendage located at the end of the forearm or forelimb of primates such as humans, chimpanzees, monkeys, and lemurs. A few other vertebrates such as the koala (which has two opposable thumbs on each "hand" and fingerprints extremely similar to human fingerprints) are often described as having "hands" instead of paws on their front limbs. The raccoon is usu..

The Battle of Churubusco took place on August 20, 1847, in Churubusco (now a suburb of Mexico City) during the Mexican–American War. Three Mexican battalions—including the Saint Patrick's Battalion made up of immigrants—took up defensive positions inside a convent and were able to repulse the American attacks until they ran out of ammunition.