Half-Life 2

Half-Life 2 (stylized as HλLF-LIFE²) is a first-person shooter video game and the sequel to Half-Life (1998). Developed by Valve Corporation, it was released on November 16, 2004, following a five-year $40 million development, during which a substantial part of the project was leaked and distributed on the Internet. The game was developed alongside Valve's Steam software. It introduced the Source game engine and, because of Steam, was the first single-player video game to require online product activation.

Some years after the events of Half-Life, protagonist Gordon Freeman is woken by the enigmatic G-Man to find the world has been taken over by the alien Combine. Joined by allies including resistance fighter Alyx Vance, Gordon searches for a way to free humanity using a variety of weapons, including the object-manipulating gravity gun.

Like its predecessor, Half-Life 2 received critical acclaim. It was praised for its advanced physics, animation, sound, AI, graphics, and narrative. The game won 39 "Game of the Year" awards and the title of "Game Of The Decade" at the 2012 Spike Video Game Awards. Over 6.5 million copies of Half-Life 2 were sold at retail by December 3, 2008, (not including Steam sales); as of February 9, 2011, Half-Life 2 had sold over 12 million copies. Half-Life 2 is considered one of the greatest video games of all time.

Half-life

Half-life (t_1⁄2) is the amount of time required for the amount of something to fall to half its initial value. The term is very commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay, but it is also used more generally for discussing any type of exponential decay.

The original term, dating to Ernest Rutherford's discovery of the principle in 1907, was "half-life period", which was shortened to "half-life" in the early 1950s. Rutherford applied the principle of a radioactive element's half-life to studies of age determination of rocks by measuring the decay period of radium to lead-206.

Half-life is used to describe a quantity undergoing exponential decay, and is constant over the lifetime of the decaying quantity. It is a characteristic unit for the exponential decay equation. The term "half-life" may generically be used to refer to any period of time in which a quantity falls by half, even if the decay is not exponential. The table on the right shows the reduction of a quantity in the number of half-lives elapsed. For a general introduction and description of exponential decay, see exponential decay. For a general introduction and description of non-exponential decay, see rate law. The converse of half-life is doubling time.

Half-life (disambiguation)

Half-life is a mathematical and scientific description of exponential or gradual decay.

Half-life may also refer to:

Biological half-life, the time it takes for a substance to lose half of its pharmacologic, physiologic, or radiologic activity

Effective half-life, the effective radioactive half-life in organisms after accounting for excretion

Half-Life (series), a video game series

Half-Life (video game), a 1998 game and the first title in the series
Half-Life 2, a 2004 sequel

Half-Life (video game), a 1998 game and the first title in the series

Half-Life 2, a 2004 sequel

Halflife (comics), the name of two different Marvel comic characters

Half-Life (novel), a 2004 novel by Aaron Krach

Half Life (novel), a 2006 novel by Shelley Jackson

Half Life (3 album), 2001

Halflife (EP), by Lacuna Coil

Half-Life E.P., by Local H

Half Life: A Parable for the Nuclear Age, a 1985 Australian documentary film

Half-Life (film), a 2008 independent film by Jennifer Phang

Halflife (Doctor Who), a 2004 BBC Books original novel written by Mark Michalowski

Modern warfare

Modern warfare is warfare using the concepts, methods, and military technology that have come into use during and after World War II and the Korean War. The concepts and methods have assumed more complex forms of the 19th- and early-20th-century antecedents, largely due to the widespread use of highly advanced information technology, and combatants must modernize constantly to preserve their battle worthiness. Although total war was thought to be the form of international conflicts from the experience of the French Revolutionary Wars to World War II, the term no longer describes warfare in which a belligerent use all of its resources to destroy the enemy's organized ability to engage in war. The practice of total war which had been in use for over a century, as a form of war policy, has been changed dramatically with greater awareness of tactical, operational, and strategic battle information.

War in modern times has been the inclusion of civilians and civilian infrastructure as targets in destroying the enemy's ability to engage in war. The targeting of civilians developed from two distinct theories. The first theory was that if enough civilians were killed, factories could not function. The second theory was that if civilians were killed, the enemy would be so demoralized that it would have no ability to wage further war. However, UNICEF reports that civilian fatalities are down from 20 percent prior to 1900 AD to less than 5 percent of fatalities in the wars beginning in the 1990s.

Episode I

Episode I, Episode 1 or Episode One may refer to:

Star Wars Episode I: The Phantom Menace, a 1999 film

Half-Life 2: Episode One, a 2006 computer game sequel

Episode I (EP), a 2000 dance EP by Eiffel 65

Episode 1 (Ashes to Ashes), (2008), the first episode of the TV series Ashes to Ashes

Episode 1 (The Casual Vacancy), (2015), the first episode of the TV miniseries The Casual Vacancy

Episode 1.1 (2007), the first episode of the TV series Primeval

Episode 1 (company), a UK investment company

Episode 1 (EP), an EP by Broiler

Ice block the size of Delaware about to break away from Antarctica as global temperatures rise, scientists warn

Edit The Independent 03 Jul 2017

Forty-Four States Refuse To Turn Over Voter Data For Trump Commission

Edit WorldNews.com 04 Jul 2017

The list of states that have refused to provide voter information to the Trump administration's election integrity commission reached 44 states on Tuesday, according to CNN. CNN performed an inquiry of all 50 states that revealed many state leaders and voting boards rejected portions of the request for the information ... What are they trying to hide?" ... "The purpose of the commission is to find facts and put them on the table ... ... "Given Sec....

photo: AP / Lee Jin-man

A man walks by a TV screen showing a news program reporting about North Korea's missile firing with an image of North Korean leader Kim Jong Un, at Seoul Train Station in Seoul, South Korea, Tuesday, July 4, 2017. North Korea on Tuesday claimed it successfully test-launched its first intercontinental ballistic missile, a potential game-changing development in what may be the world's most dangerous nuclear standoff and, if true, a direct rebuke to U.S. President Donald Trump's earlier declaration that such a test

U.S. Requests U.N. Security Council Meeting In Response To North Korean ICBM Launch

Edit WorldNews.com 04 Jul 2017

The United States on Tuesday requested a closed-door meeting of the 15-member U.N. Security Council on North Korea’s latest missile launch, which weapons experts said was an actual international ballistic missile (ICBM), Reuters reports.A session is likely to be scheduled for Wednesday, a spokesman for the U.S. mission to the United Nations said on Tuesday.Monday’s launch, on the eve of U.S ... ....

photo: Creative Commons / Mariordo

Aerial view of The Pentagon. The Pentagon building spans 28.7 acres (116,000 m2), and includes an additional 5.1 acres (21,000 m2) as a central courtyard.

Pentagon vows to protect US & allies after Pyongyang’s ‘escalatory ICBM test’

Edit Russia Today 05 Jul 2017

The Pentagon has vowed to defend the US and its allies against any possible North Korean threat after Washington confirmed Pyongyang’s claim that it has developed the technology to potentially deliver a nuclear warhead to the US mainland ... ....

photo: AP / Jeff Chiu

Attorney and former FBI Director Robert Mueller, right, arrives for a court hearing at the Phillip Burton Federal Building in San Francisco, Thursday, April 21, 2016.

Russian Organized Crime Could Play Major Role in Mueller Investigation

Edit WorldNews.com 04 Jul 2017

The concerns that Russian organized crime could play a role in threatening democratic institutions in the United States have never been clearer and the ongoing special counsel investigation into possible collusion between the Russian government and "criminally linked oligarchs" could put things even more into focus, according to The Associated Press ... Russia is also known for a lack of cooperation with the U.S ... 11 attacks....

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Malasada Bread Pudding

Edit Star Advertiser 05 Jul 2017

In bowl, blend half-and-half, eggs, butter, brown sugar, vanilla and spices ... (If mixture seems dry, stir in 1/2 cup additional half-and-half or milk.) Let stand 30 minutes or more....

Flight Centre shares soar after company lifts profit outlook

Edit Sydney Morning Herald 05 Jul 2017

Shares of Flight Centre have jumped in early trading after the company raised its full-year earnings forecast following stronger-than-expected sales and profit in the second half ... first half....

Atlanta United 4, San Jose 2: Player ratings

Edit Atlanta Journal 05 Jul 2017

Chased down Thompson for a corner near the end of the first half ... Reads the game so well… Tried a 30-yard shot in the first half that wasn’t handled well by Bingham ... His giveaway — and failure to track back — led to San Jose’s first goal … Took four low-percentage shots in the first half. … Didn’t add much in the second half ... SUBS ... Just missed scoring on a header late in the second half. ....

Hong Kong new flat sales exceed 10,000, highest 6-month figure since 2005

Edit South China Morning Post 05 Jul 2017

Hong Kong developers’ aggressive home financing scheme and bigger mortgage loans have pushed sales of new flats to surpass the 10,000 mark in the first half of this year, the highest six-month figure since 2005, according to property agents. The first-half figure from agents came as the Land Registry announced on Tuesday that the number of ......

Restore HWT clock to - former glory

Edit The Gleaner 05 Jul 2017

THE EDITOR, Sir.Half-Way Tree Square is the premier hub of activity for Kingston and St Andrew. The area is a bustling commuter location and business district.The Half-Way Tree clock, an iconic landmark, should be a source of pride for Jamaicans and... ....

Persimmon revenue up 12% on higher sales

Edit Market Watch 05 Jul 2017

LONDON--Persimmon PLC (PSN.LN) said Wednesday that first-half revenue rose 12% to 1.66 ......

Timaru Boys' romp to the top of the UC Championship

Edit Stuff 05 Jul 2017

Despite wet conditions, TBHS scored eight tries in the first half and a further six in the second half to demoralise Roncalli in their 38th straight defeat in the competition ... St Andrew's College ran in four second half tries to blow out Waimea Combined 40-12 in Christchurch. St Andrew's first five-eighth Llew Johnson contributed 25 points, including a second half hat-trick, after the hosts led 14-7 at halftime ... Ad Feedback....

Summer Berry Clafoutis makes for a fruity, sweet delight

Edit Rocky Mount Telegram 05 Jul 2017

One of the great, great, great (three times, that's how great it is) pleasures of summer is figuring out what to do with all that fruit that floods the markets. Stone fruits like plums, peaches, nectarines, cherries; melons of all stripes; and berries. Oh, the berries. We eat them by the fistful when we're lucky ... One of my favorites is a clafoutis ... ___ ... 1 1/2 cups half-and-half ... Slowly pour in the half-and-half and whisk until incorporated....

Ranbir Kapoor-Katrina Kaif to go back to school for this reason

Edit DNA India 05 Jul 2017

Director Anurag Basu had said that the audience will see him playing a character half his age for the first time ... a character half his age for the first time....

New car sales in Brazil pick up for first time since 2013

Edit Xinhua 05 Jul 2017

BRASILIA, July 4 (Xinhua) -- New car sales in Brazil rose 3.65 percent in the first half of the year compared to the same period of 2016, showing ......

Queues and confusion after sick pilot grounds Air New Zealand flight to Hong Kong

Edit Stuff 05 Jul 2017

A flight to Hong Kong was forced to return to Auckland after one of its pilots fell sick soon after take-off ... READ MORE. ... The decision was made to turn the flight around about two and a half hours later, she said ... "Then they were lined up for an hour and a half, just to receive a slip of paper telling them to call this 0800 number and rebook themselves on a flight." ... "[Air New Zealand] had at least two and a half hours notice....

Gunmen on the loose in 'grey city taxi'

Edit Jamaica Observer 05 Jul 2017

The Half-Way-Tree police, in a report issued on Monday through the CCU, described the act as an “emerging trend”, where the perpetrators typically operate in the morning and evening peak hours and frequent routes along Molynes Road, Papine and Hagley Park Road, destined for Half-Way-Tree, the St Andrew capital....

Capital returning to EMs given GST rollout progress, NPA resolution: JPMorgan

Edit Moneycontrol 05 Jul 2017

Dollar ... JPMorgan ... Adrian Mowat of JPMorgan said the MSCI Emerging Market index rallied 17 percent in the first half of 2017 outperforming Developed Market by 8 percent. This was the best first half performance since 2009 ... ....

Math proof Hilary won popular vote

Edit Democratic Underground 05 Jul 2017

For instance the percentage of Arizona death certificates designated Hispanic means that if the inflated estimates of illegals in Arizona were correct then the illegals have a life expectancy of about 300 years ... Almost half live in states with strict ID laws to register or vote, like Texas, Arizona, Florida, Georgia etc....

China's IPOs surge in first half of 2017

Edit China Daily 05 Jul 2017

About 119 enterprises were listed on the Shanghai Stock Exchange and 128 on the Shenzhen Stock Exchange went public in the first half of 2017, according to the KPMG 2017 Mid-Year Review....

Half-Life 2

Half-life

Half-life (disambiguation)

Modern warfare

Episode I

See also

Half-Life 2 - Full Walkthrough in HD【NO Commentary】

Half Life 2 - Episode 1 - WAKE UP GORDON FREEMAN

PC Longplay [116] Half-Life 2 (Part 1 of 5)

Half Life 2 Updated Review - Worthabuy?

Half-Life 2: RETREAT - Full Walkthrough 【NO Commentary】

Half Life 2 - Walkthrough - Part 1 - Throwing Cans

Half Life 2 Trailer

Half Life 2 - Prospekt | Harry Callaghan - Voice Over Reel

Nerd³ Plays... Half Life 2

Super low Half-Life 2 on an Intel Atom

Half-Life 2 - Full Walkthrough in HD【NO Commentary】

Half Life 2 - Episode 1 - WAKE UP GORDON FREEMAN

PC Longplay [116] Half-Life 2 (Part 1 of 5)

Half Life 2 Updated Review - Worthabuy?

Half-Life 2: RETREAT - Full Walkthrough 【NO Commentary】

Half Life 2 - Walkthrough - Part 1 - Throwing Cans

Half Life 2 Trailer

Half Life 2 - Prospekt | Harry Callaghan - Voice Over Reel

Nerd³ Plays... Half Life 2

Super low Half-Life 2 on an Intel Atom

Half-Life 2 - Full Walkthrough in HD【NO Commentary】

Half Life 2 - Episode 1 - WAKE UP GORDON FREEMAN

PC Longplay [116] Half-Life 2 (Part 1 of 5)

Half Life 2 Updated Review - Worthabuy?

Half-Life 2: RETREAT - Full Walkthrough 【NO Commentary】

Half Life 2 - Walkthrough - Part 1 - Throwing Cans

Half Life 2 Trailer

Half Life 2 - Prospekt | Harry Callaghan - Voice Over Reel

Nerd³ Plays... Half Life 2

Super low Half-Life 2 on an Intel Atom

Half-Life 2 - Full Walkthrough in HD【NO Commentary】

Half Life 2 - Episode 1 - WAKE UP GORDON FREEMAN

PC Longplay [116] Half-Life 2 (Part 1 of 5)

Half Life 2 Updated Review - Worthabuy?

Half-Life 2: RETREAT - Full Walkthrough 【NO Commentary】

Half Life 2 - Walkthrough - Part 1 - Throwing Cans

Half Life 2 Trailer

Half Life 2 - Prospekt | Harry Callaghan - Voice Over Reel

Nerd³ Plays... Half Life 2

Super low Half-Life 2 on an Intel Atom

Half-Life 2 - Full Walkthrough in HD【NO Commentary】

Half Life 2 - Episode 1 - WAKE UP GORDON FREEMAN

PC Longplay [116] Half-Life 2 (Part 1 of 5)

Half Life 2 Updated Review - Worthabuy?

Half-Life 2: RETREAT - Full Walkthrough 【NO Commentary】

Half Life 2 - Walkthrough - Part 1 - Throwing Cans

Half Life 2 Trailer

Half Life 2 - Prospekt | Harry Callaghan - Voice Over Reel

Nerd³ Plays... Half Life 2

Super low Half-Life 2 on an Intel Atom

Half-Life 2 10

Half life 2 Страшненько...

Half-life 2 Начало#

Half-Life 2 | Shoutouts

Half-Life 2

Half-Life 2 #4

Half-Life 2 #11

Half Life 2 Deathmatch

#1 Half life 2

Half Life 2 (1)

Half-Life 2 10

Half life 2 Страшненько...

Half-life 2 Начало#

Half-Life 2 | Shoutouts

Half-Life 2

Half-Life 2 #4

Half-Life 2 #11

Half Life 2 Deathmatch

#1 Half life 2

Half Life 2 (1)

Related Sites

Related Sites

Half-Life 2 - Full Walkthrough in HD【NO Commentary】

Half Life 2 - Episode 1 - WAKE UP GORDON FREEMAN