Roll call is the calling of the names of people from a list (roll) to determine the presence or absence of the listed people (also known as a register in regions such as the United Kingdom). The term applies to the calling itself, to the time moment of this procedure, and to a military signal that announces it (e.g. by a drum).

Roll calls are used in places such as classrooms, the military, prisons, law enforcement, camps, and Model United Nations.

In traditions of some schools, the term Roll Call refers to a general assembly for various daily announcements.

The Roll Call of Honor is a ceremonial roll call of honorably fallen people or a list of these people.

Both houses of the United States Congress are given broad latitude to establish their own rules under Article One of the United States Constitution. No court has ever challenged this occasionally controversial practice by striking down a law passed without the physical presence of a majority of senators in the chamber at the time of passage, although there have been attempts to challenge some acts on this ground, such as the Palm Sunday Compromise in the case of Terri Schiavo.

Jonathan Smith (born January 27, 1971), better known by his stage name Lil Jon, is an American rapper, music producer, entrepreneur, and international DJ who was a member of the group Lil Jon & The East Side Boyz. Lil Jon formed the group in 1997, and the group released several albums between then and 2004. He then went solo and released a new album in 2010 called Crunk Rock.

Lil' Jon was born and raised in Atlanta, Georgia. He graduated from Frederick Douglass High School.

After working as a DJ for Atlanta night clubs, he started working for So So Def Recordings between 1993 and 2000. The group signed to the Atlanta-based Mirror Image Records and were distributed by Ichiban Records. In 1997, Lil' Jon & the East Side Boyz debuted with Get Crunk, Who U Wit: Da Album. It included singles "Who U Wit?" and "Shawty Freak a Lil' Sumthin'", the latter of which came out in 1998. Both singles charted on the Billboard Hot R&B/Hip-Hop Songs chart at No. 70 and No. 62 respectively. In 2000 Jon took part in starting up his own label BME Recordings and signed a distribution agreement with Norcross, Georgia based Southern Music Distribution. There he released his break through album titled We Still Crunk. Among the tracks on that project was the hit single "I Like Dem Girlz", which reached No. 55 on the R&B chart and No. 3 on the Hot Rap Tracks chart.

Ice cubes are small, roughly cube-shaped pieces of ice, conventionally used to cool beverages. Ice cubes are sometimes preferred over crushed ice because they melt more slowly; they are standard in mixed drinks that call for ice, in which case the drink is said to be "on the rocks."

Ice cubes that are crushed or sheared into irregularly-shaped flakes may add an interesting aesthetic effect to some cocktails. Crushed ice is also used when faster cooling is desired, since the rate of cooling is governed by the number and average radius of the ice particles.

Melting ice cubes sometimes precipitate white flakes, commonly known as "floaties". This is calcium carbonate which is present in many water supplies and is completely harmless.^{[citation needed]}

American physician and humanitarian John Gorrie built a refrigerator in 1844 with the purpose of cooling air. His refrigerator produced ice which he hung from the ceiling in a basin. Gorrie can be considered the creator of ice cubes, but his aim was not to cool drinks: he used the ice to lower the ambient room temperature. During his time, a dominant idea was that bad air quality caused disease. Therefore, in order to help treat sickness, he pushed for the draining of swamps and the cooling of sickrooms.