Fatigue (also called exhaustion, lethargy, languidness, languor, lassitude, and listlessness) is a state of awareness describing a range of afflictions, usually associated with physical and/or mental weakness, though varying from a general state of lethargy to a specific work-induced burning sensation within one's muscles. Physical fatigue is the inability to continue functioning at the level of one's normal abilities. It is widespread in everyday life, but usually becomes particularly noticeable during heavy exercise. Mental fatigue, on the other hand, rather manifests in somnolence (sleepiness).

Fatigue is a non-specific symptom, which means that it has many possible causes. Fatigue is considered a symptom, as opposed to a medical sign, because it is reported by the patient instead of being observed by others. Fatigue and ‘feelings of fatigue’ are often confused.

Physical fatigue or muscle weakness and/or aches, (or "lack of strength") is a direct term for the inability to exert force with one's muscles to the degree that would be expected given the individual's general physical fitness.

Joseph Arthur (born September 28, 1971) is an American singer-songwriter and artist from Akron, Ohio. Combining poetic lyrics with a layered sonic palette, Arthur has built his reputation over the years through critically acclaimed releases and constant touring; his unique solo live performances incorporate the use of a number of distortion and loop pedals, and his shows are recorded live at the soundboard and made available to concertgoers immediately following the show on recordable media. Arthur was discovered by Peter Gabriel in the mid-'90s, and signed to Gabriel's Real World label as the first North American artist on the label's roster. Arthur released his debut album Big City Secrets (1997) and follow-up, Come to Where I'm From (2000) on Real World before signing with various independent labels between 2002 and 2006. He established his own record label, Lonely Astronaut Records, in 2006, and released two studio albums, Let's Just Be (2007) and Temporary People (2008) with backing band The Lonely Astronauts. Arthur subsequently returned to performing and recording as a solo artist, releasing The Graduation Ceremony in 2011 and the double album, Redemption City in 2012.

Rafael Edward Cruz, known as Ted Cruz (born December 22, 1970), is the former Solicitor General of the U.S. state of Texas, a position which he held from 2003 to May 2008. Cruz was appointed by Texas Attorney General Greg Abbott. He was the first Hispanic Solicitor General in Texas, the youngest Solicitor General in the United States, and had the longest tenure in the post thus far in Texas history. He is currently a partner at the law firm Morgan, Lewis & Bockius, where he leads the firm’s U.S. Supreme Court and national appellate litigation practice.

Cruz is a candidate for the 2012 Republican nomination for the United States Senate seat being vacated by Kay Bailey Hutchison.

Cruz previously served as the director of the Office of Policy Planning at the Federal Trade Commission, an Associate Deputy Attorney General at the United States Department of Justice, and as Domestic Policy Advisor to U.S. President George W. Bush on the 2000 Bush-Cheney campaign. In addition, from 2004-2009 Cruz was an Adjunct Professor of Law at the University of Texas School of Law in Austin, where he taught U.S. Supreme Court litigation.

David Eric "Dave" Grohl (born January 14, 1969) is an American rock musician, multi-instrumentalist, and singer-songwriter, who is the lead vocalist, guitarist, primary songwriter and founder of the Foo Fighters, prior to which he was the drummer in the grunge band Nirvana. He is also the drummer and co-founder of the rock supergroup Them Crooked Vultures. Grohl has additionally written all the music and performed all the instruments for his short-lived side projects Late! and Probot, as well as being involved with Queens of the Stone Age numerous times throughout the past decade. He has performed session work (as a drummer) for a variety of musicians, including Garbage, Killing Joke, Nine Inch Nails, The Prodigy, Slash, Juliette Lewis, Tenacious D, Tom Petty and the Heartbreakers, and Lemmy Kilmister.

As a child, Grohl's family relocated from Warren, Ohio, to Springfield, Virginia, a suburb of Washington, D.C. Three years later, when Grohl was six, his parents divorced, and Grohl grew up living with his mother.