Knowledge

The Knowledge aspiration causes Sims to want to know everything there is to know about anything.

Knowledge is introduced in The Sims 2, The Sims 2 Console, The Sims 2 PSP, The Sims 2 Pets Console and The Sims Stories

The Sims 2 Console
Knowledge is pretty much easier in the console versions because they don't fear becoming a human (eg. Ghost to human), but the Wants and Fears (The Sims 2 only) are Similar

The Sims 2 PSP
In The Sims 2 PSP, having Knowledge gives you Knowledge only Perks and Knowledge Goals.

Pleasantview

 * Mortimer Goth
 * Darren Dreamer
 * Michael Bachelor

Strangetown

 * Pascal Curious
 * Lazlo Curious
 * Vidcund Curious
 * Loki Beaker
 * Olive Specter

Veronaville

 * Kent Capp
 * Antonio Monty
 * Oberon Summerdream

Wants

 * Get A+ on report card
 * Get into private school
 * Go to college
 * Get scholarship

Fears

 * Don't go to college
 * Get rejected from private school
 * Get D on report card
 * Miss the school bus

Aspiration Meter Levels

 * Platinum: Young Genius
 * Gold: Whiz Kid
 * High Green: Smarty Pants
 * Low Green: Solid Student
 * Low Red: Addled Adolescent
 * High Red: Dense Dunce

Young Adults
Knowledge Sims will have wants that revolve around getting good grades and a high GPA. They will not put as much emphasis on increasing skill points.

Wants

 * Make Dean's List
 * Graduate with honors
 * Do assignment
 * Go to class
 * Write term paper

Fears

 * Get on academic probation
 * Get kicked out of college

Adults
Adults have general wants and fears. However, they will often want to gain skill points and max out skills, and to buy skillbuilding objects. They may also want to experience things that other Sims would not want, and may even fear, such as seeing a ghost or being abducted by aliens. If Pets is installed, they may want to see a wolf, and even become a werewolf. If Seasons is installed, they may even want to be struck by lightning.

Aspiration Meter Levels

 * Platinum: Savant Supreme
 * Gold: Impressive Intellect
 * High Green: Free Thinker
 * Low Green: Brain Stretcher
 * Low Red: Silly Goose
 * High Red: Incredible Ignoramus

Elders
Elders have general wants and fears. However, they will often want to gain skill points and max out skills, and to buy skillbuilding objects. They may also want to experience things that other Sims would not want, and may even fear, such as seeing a ghost or being abducted by aliens. If Pets is installed, they may want to see a wolf, and even become a werewolf. If Seasons is installed, they may even want to be struck by lightning.

Aspiration Meter Levels

 * Platinum: Senior Sage
 * Gold: Wizened Wise One
 * High Green: Mature Mastermind
 * Low Green: Well-Read Whitehair
 * Low Red: Decaying Dullard
 * High Red: Senile Simpleton

Wants

 * Buy telescope
 * Buy a bookcase
 * Buy a telescope cost 2,500
 * Buy a bookcase costing...
 * Get abducted by aliens
 * Sim meets aliens
 * Gain a skill point
 * Reach skill level...
 * Gain a ... skill point
 * Become a ... (depends on what creatures are available)
 * Maximize all skill points
 * Buy a ... station (Open for Business/Freetime)
 * See a ghost
 * Be saved from death
 * Get a job in the ... career
 * Reach talent badge level ...(Open for Business/Freetime)
 * Meet Bigfoot (Bon Voyage)

Fears

 * Lose a skill point
 * Get cured from... (depends on what creatures are available)

Base Game

 * Become Chief of Staff
 * Become Criminal Mastermind
 * Become Mad Scientist
 * Max out 7 Skills

Seasons

 * Become Education Minister
 * Become Game Designer
 * Become Space Pirate
 * Become Media Magnate

Freetime

 * Become City Planner
 * Become Hand of Poseidon
 * Become Prestidgitator
 * Become World Class Ballet Dancer

Aspiration Desperations
When the aspiration bar is at high red for a long time, the Sim will pull out and talk to a volleyball with a face and mortarboard on it, which according to the intreaction is named "Professor von Ball".

FreeTime Aspiration Benefits

 * Level 1 - Slower Social and Fun Motive Decay
 * Level 2 - Impart Knowledge
 * Level 3 - Eureka!
 * Level 4 - Summon Aliens

Base Game

 * Science
 * Medicine
 * Criminal

Seasons

 * Education
 * Gamer
 * Journalism
 * Adventurer

Freetime

 * Dance
 * Entertainment
 * Intelligence
 * Architecture
 * Oceanography

Tips & Tricks

 * Knowledge sims make good love matches for Family sims, as they will usually want to get married and have at least one child.
 * Knowledge sims are also the only sims who do not fear becoming a a special being (Vampire, Werewolf, ect). In fact, it can be used to boost your aspiriation, curing it when it is no longer a fear to be cured. The want to become a special being is probably due to the fact that they want to know more about them, and what better way to learn about them by being one?
 * Knowlede sims also have different animations when flirting or kissing. Their animations reflect being shy or hesitation when flirting or using romantic interactions. You can use this to figure out which sim is a knowledge sim if you are looking through townies to marry or date.