Toxicity

Toxicity is the degree to which a substance can damage an organism. Toxicity can refer to the effect on a whole organism, such as an animal, bacterium, or plant, as well as the effect on a substructure of the organism, such as a cell (cytotoxicity) or an organ such as the liver (hepatotoxicity). By extension, the word may be metaphorically used to describe toxic effects on larger and more complex groups, such as the family unit or society at large.

A central concept of toxicology is that effects are dose-dependent; even water can lead to water intoxication when taken in too high a dose, whereas for even a very toxic substance such as snake venom there is a dose below which there is no detectable toxic effect. Toxicity is species-specific, making cross-species analysis problematic. Newer paradigms and metrics are evolving to bypass animal testing, while maintaining the concept of toxicity endpoints.

Types of toxicity

There are generally three types of toxic entities; chemical, biological, and physical:

Holiday

A holiday is a day set aside by custom or by law on which normal activities, especially business or work, are suspended or reduced. Generally, holidays are intended to allow individuals to celebrate or commemorate an event or tradition of cultural or religious significance. Holidays may be designated by governments, religious institutions, or other groups or organizations. The degree to which normal activities are reduced by a holiday may depend on local laws, customs, the type of job being held or even personal choices.

The concept of holidays has most often originated in connection with religious observances. The intention of a holiday was typically to allow individuals to tend to religious duties associated with important dates on the calendar. In most modern societies, however, holidays serve as much of a recreational function as any other weekend days or activities.

In many societies there are important distinctions between holidays designated by governments and holidays designated by religious institutions. For example, in many predominantly Christian nations, government-designed holidays may center on Christian holidays, though non-Christians may instead observe religious holidays associated with their faith. In some cases, a holiday may only be nominally observed. For example, many Jews in the Americas and Europe treat the relatively minor Jewish holiday of Hanukkah as a "working holiday", changing very little of their daily routines for this day.

Star

A star is a luminous sphere of plasma held together by its own gravity. The nearest star to Earth is the Sun. Other stars are visible to the naked eye from Earth during the night, appearing as a multitude of fixed luminous points in the sky due to their immense distance from Earth. Historically, the most prominent stars were grouped into constellations and asterisms, and the brightest stars gained proper names. Extensive catalogues of stars have been assembled by astronomers, which provide standardized star designations.

For at least a portion of its life, a star shines due to thermonuclear fusion of hydrogen into helium in its core, releasing energy that traverses the star's interior and then radiates into outer space. Once the hydrogen in the core of a star is nearly exhausted, almost all naturally occurring elements heavier than helium are created by stellar nucleosynthesis during the star's lifetime and, for some stars, by supernova nucleosynthesis when it explodes. Near the end of its life, a star can also contain degenerate matter. Astronomers can determine the mass, age, metallicity (chemical composition), and many other properties of a star by observing its motion through space, luminosity, and spectrum respectively. The total mass of a star is the principal determinant of its evolution and eventual fate. Other characteristics of a star, including diameter and temperature, change over its life, while the star's environment affects its rotation and movement. A plot of the temperature of many stars against their luminosities, known as a Hertzsprung–Russell diagram (H–R diagram), allows the age and evolutionary state of a star to be determined.

Lip Sync Battle

Lip Sync Battle is an American musical reality competition television series which premiered on April 2, 2015, on Spike cable network. The show is based on an idea introduced to Late Night with Jimmy Fallon by John Krasinski, in which celebrities battle each other with lip sync performances. It was used (and is still used) as a recurring segment on The Tonight Show Starring Jimmy Fallon before it was developed into a separate show.

The premiere episode was the highest-rated premiere in Spike's history. Lip Sync Battle has been a hit show for the network; it was renewed for a second season, which premiered on January 7, 2016. An hour-long holiday special aired on November 19, 2015. In January 2016, the series was renewed for a third season. The series' success has lead to the creation of various international adaptions.

Overview

Lip Sync Battle debuted on the American cable network Spike, on Thursday April 2, 2015. It is produced by John Krasinski and Stephen Merchant and hosted by rapper and actor LL Cool J. Model Chrissy Teigen serves as color commentator.

Boot camp

Boot camp may refer to:

Training programs

Music

Other