Science

Science is a Fallout, Fallout 2, Fallout 3, Fallout Tactics, Fallout: New Vegas, Van Buren and J.E. Sawyer's Fallout Role-Playing Game skill.

It covers a variety of high-technology skills, such as computers, biology, physics, and geology.

Fallout, Fallout 2 and Fallout Tactics
Initial Level: Starting Science skill is equal to 25% + (2 x Intelligence). This formula would mean average characters will have a 35% Science skill (25% + (2 x 5)), with the minimum value being 27% and the maximum 45%.

The Fallout Tactics 1.27 patch notes readme file says: The science bonus to criticals on robots is working properly suggesting that Science somehow affects critical chance or effectiveness against robots (at least in Tactics).

Fallout 3
Science allows you to hack terminals using a mini-game. Terminals have different difficulty levels, and they require different science skill levels. The difficulty ratings and skill levels are: Very Easy (15), Easy (25), Average (50), Hard (75), and Very Hard (100). This is one of the few skills that may be useful to find a way to raise it to 100% (like Lockpick) as some terminals require such a high level. On the other hand, there are few terminals which require 75 Science skill and even less that require 100. The relative values of your science level and the difficulty rating affects how hard the minigame is (at 100 Science, average terminals are a breeze, presenting only about 5 possible passwords). Harder terminals have more words, longer words, and fewer brackets for removing duds.

This particular skill is able to be raised by the science-oriented book, the Big Book of Science.

Science also determines the probability of your success in disarming a slave collar.