Power of two

In mathematics, a power of two means a number of the form 2ⁿ where n is an integer, i.e. the result of exponentiation with number two as the base and integer n as the exponent.

In a context where only integers are considered, n is restricted to non-negative values, so we have 1, 2, and 2 multiplied by itself a certain number of times.

Because two is the base of the binary numeral system, powers of two are common in computer science. Written in binary, a power of two always has the form 100…000 or 0.00…001, just like a power of ten in the decimal system.

Expressions and notations

Verbal expressions, mathematical notations, and computer programming expressions using a power operator or function include:

Computer science

Two to the power of n, written as 2ⁿ, is the number of ways the bits in a binary word of length n can be arranged. A word, interpreted as an unsigned integer, can represent values from 0 (000…000) to 2ⁿ − 1 (111…111) inclusively. Corresponding signed integer values can be positive, negative and zero; see signed number representations. Either way, one less than a power of two is often the upper bound of an integer in binary computers. As a consequence, numbers of this form show up frequently in computer software. As an example, a video game running on an 8-bit system might limit the score or the number of items the player can hold to 255—the result of using a byte, which is 8 bits long, to store the number, giving a maximum value of 2⁸ − 1 = 255. For example, in the original Legend of Zelda the main character was limited to carrying 255 rupees (the currency of the game) at any given time, and the video game Pac-Man famously shuts down at level 255.

Crash Course

Crash Course (also known as Driving Academy) is a 1988 made for television teen film directed by Oz Scott.

Plot

Crash Course centers on a group of high schoolers in a driver’s education class; many for the second or third time. The recently divorced teacher, super-passive Larry Pearl, is on thin ice with the football fanatic principal, Principal Paulson, who is being pressured by the district superintendent to raise driver’s education completion rates or lose his coveted football program. With this in mind, Principal Paulson and his assistant, with a secret desire for his job, Abner Frasier, hire an outside driver’s education instructor with a very tough reputation, Edna Savage, aka E.W. Savage, who quickly takes control of the class.

The plot focuses mostly on the students and their interactions with their teachers and each other. In the beginning, Rico is the loner with just a few friends, Chadley is the bookish nerd with few friends who longs to be cool and also longs to be a part of Vanessa’s life who is the young, friendly and attractive girl who had to fake her mother’s signature on her driver’s education permission slip. Kichi is the hip-hop Asian kid who often raps what he has to say and constantly flirts with Maria, the rich foreign girl who thinks that the right-of-way on the roadways always goes to (insert awesomely fake foreign Latino accent) “my father’s limo”. Finally you have stereotypical football meathead J.J., who needs to pass his English exam to keep his eligibility and constantly asks out and gets rejected by Alice, the tomboy whose father owns “Santini & Son” Concrete Company. Alice is portrayed as being the “son” her father wanted.

List of Primeval episodes

This is a list of episodes for the British television drama series Primeval. It premiered on ITV on 10 February 2007 and ran for five series and 36 episodes in total. It was cancelled in June 2009 after the third series, with the network stating it was struggling to fund any more original programming. On 29 September 2009, the station announced it had formed a deal with the digital channels Watch, BBC America, and German broadcaster Pro7, to recommission the programme for the fourth and fifth series. Series 5 of six episodes began on 24 May 2011 on digital channel Watch and was repeated on ITV from 16 June 2012.

Series overview

The first series revolves around "the team" forming, following several creature attacks in the Forest of Dean, as well as Nick Cutter's search for Helen Cutter, his missing wife, who had suddenly reappeared after eight years. Throughout the series, Nick becomes romantically involved with James Lester's PA, Claudia Brown. In the first series' finale Cutter travels through a time anomaly, and upon his return he discovers that Claudia Brown no longer exists, and the timeline has changed. In Series 2, Cutter adjusts to the new timeline while hunting for a traitor in the group. It marks the last appearance of the character Stephen Hart, who dies at the end of the series. In the third series, Cutter is killed, while Jason Flemyng joins the cast as Police Officer Danny Quinn. Ben Mansfield also joins as Captain Becker, the team's armed support, replacing Stephen Hart. The climax has Connor, Abby and Quinn pursuing Helen through anomalies to prevent her exterminating the human ancestors. They succeed, Helen is killed, but they remain trapped in past eras.

Tick Tack

Tick Tack may refer to:

Head 2 Head

Head 2 Head was a sports quiz show that aired on ABC TV in Australia between 18 February and 9 December 2006 and broadcast on Saturday evenings initially at 6 pm, then at 5 pm. The show was hosted by Ashley Bradnam and produced by Nick Price.

Quiz format

The show format was for two contestants to answers sports trivia questions over four "quarters".

In the first quarter, competitors would answer ten general questions, all of which were either multiple choice or "true or false". One point was awarded for a correct answer and there was no penalty for an incorrect answer.

In the second quarter, competitors would answer up to twenty questions on a specialty topic in a maximum period of two minutes. The topics would be chosen by the contestants several weeks prior to the show. As with the first quarter, one point was awarded for a correct answer and there was no penalty for an incorrect answer.

The third quarter lasts two minutes and is a more traditional quiz show "buzzer round", again with general sports questions. One point is awarded for a correct answer but one point is now lost for an incorrect answer.