[T]he player's main objective is to construct a civilization from limited initial resources. Most standard full-length games start the player with the a settler unit and/or a city unit in the year 4000 BC. As with other games in the series, there are by default five objectives the player can pursue in order to finish the game: conquering other civilizations, controlling a supermajority of the game world's land and population, building and sending the first sleeper ship to the Alpha Centauri star system, increasing the "Culture ratings" of at least three different cities to "legendary" levels, or winning a "World Leader" popularity contest by the United Nations. However, if the time limit for the game is reached and none of the previous goals has been fulfilled by any players including game AI players, the civilization with the highest total game score is declared winner. A large departure from earlier Civilization games is a new graphics engine created from scratch, based on the Gamebryo engine by Numerical Design Limited (NDL).

The game has generally received nearly universal acclaim and was hailed as an example product of one of the leading video game producers in the turn-based strategy genre. Civilization IV has sold 3 million copies and won multiple awards, including several Game of the Year awards. In addition to this, Firaxis Games has also released two other major expansions, Civilization IV: Warlords and Civilization IV: Beyond the Sword, plus the standalone game Civilization IV: Colonization, which were all combined in 2007 into one release edition titled Sid Meier's Civilization IV: The Complete Edition.

Source: Wikipedia

[T]he formation of Earth and the rise of man as told in Sid Meier's Civilization IV, and as narrated by Leonard Nimoy.

All of the Civilization IV Tech quotes including those in Beyond the Sword and Warlords expansions.
They are all in alphabetical order, so enjoy!

Go to Firaxis Games\Sid Meier's Civilization 4 Complete\Assets\Sounds\Tech to find the mp3s yourself if you own the game.

"The Wheel" and "Theology" are mixed up, because one alphabetical order ignored "The" and the other didn't.

Edited with: Camtasia Studio 7

Advanced Flight: 0:07
Aesthetics: 0:16
Agriculture: 0:27
Alphabet: 0:34
Animal Husbandry: 0:44
Archery: 0:50
Artillery: 0:57
Assembly Line 1:04
Astronomy: 1:09
Banking: 1:18
Biology: 1:23
Bronze Working: 1:30
Calendar: 1:41
Chemistry: 1:48
Civil Service: 1:56
Code of Laws: 2:03
Combustion: 2:10
Communism: 2:16
Compass: 2:25
Composites: 2:30
Computers: 2:35
Constitution: 2:40
Construction: 2:49
Corporation: 2:59
Currency: 3:09
Democracy: 3:14
Divine Right: 3:23
Drama: 3:26
Ecology: 3:38
Economics: 3:45
Education: 3:51
Electricity: 3:56
Engineering: 4:03
Fascism: 4:12
Feudalism: 4:20
Fiber Optics: 4:28
Fishing: 4:35
Fission: 4:43
Flight: 4:55
Fusion: 5:06
Future Tech: 5:13
Genetics: 5:16
Guilds: 5:24
Gunpowder: 5:35
Horseback Riding: 5:43
Hunting: 5:48
Industrialism: 5:53
Iron Working: 6:05
Laser: 6:10
Liberalism: 6:19
Literature: 6:28
Machinery: 6:36
Masonry: 6:40
Mass Media: 6:47
Mathematics: 6:53
Medicine: 7:04
Meditation: 7:12
Metal Casting: 7:22
Military Science: 7:28
Military Tradition: 7:36
Mining: 7:45
Monarchy: 7:52
Monotheism: 7:59
Music: 8:06
Mysticism: 8:11
Nationalism: 8:18
Optics: 8:28
Paper: 8:33
Philosophy: 8:37
Physics: 8:47
Plastics: 8:53
Polytheism: 8:59
Pottery: 9:07
Priesthood: 9:14
Printing Press: 9:26
Radio: 9:32
Railroad: 9:40
Refrigeration: 9:48
Replaceable Parts: 9:54
Rifling: 9:59
Robotics: 10:04
Rocketry: 10:10
Sailing: 10:17
Satellites: 10:24
Scientific Method: 10:29
Stealth: 10:39
Steam Power: 10:48
Steel: 10:58
Superconductors: 11:04
Theology: 11:12
The Wheel: 11:22
Writing: 11:26

Source: YouTube

In Civilisation IV, the job of narrating your technological advances was handled famously by Leonard Nimoy, who did one of the best game narration jobs in the history of the medium.

Source: A Fan

I mean, perhaps it's the geeky little fanboy within me (the "inner geek" so to speak), but remember how cool it was when you first played Civ IV, researched your first tech, and heard a strangely familiar voice reading to you? Upon reflection, it was a crucial factor in my compulsion to play those first few games, trying to research every and any tech available, just to hear him speak...

Source: A Fan

Civilization IV: Beyond The Sword

Bad news - they didn't bring back Leonard Nimoy. The highlight of Civ IV, was of course, the befuddled-sounding Mr Spock solemnly intoning "BEEP. BEEP. BEEP" upon the discovery of satellites, or confusedly quoting Velvet Underground lyrics when rock'n'roll was created.

While Beyond the Sword is an excellent expansion pack in all other ways, that a few more shillings could not be raised to have the poor soul record new lines deserves a mournful moment of silence. Instead, Sid Meier steps into the breach to dole out the requisite quote whenever a technology not already in the parent game is researched. The man's a legend for sure, but unfortunately he has exactly the voice you'd expect of a middle-aged American game developer. Hint: it's a few octaves higher and a whole lot more whiny than you'd really want of a disembodied voice that announces you've just made one of all history's greatest discoveries. Let's have Spock for God again, please.

Source: eurogamer.net