The Genius task is to research all technology; successful completion of the task grants the Tower of Wisdom monument.
Philosophy was introduced in update 1.7.
Literacy reduces the cost of all technologies by 33%.
In beta, Philosophy unlocked the Library, a building that decreased the costs of technologies. The Library was scrapped and replaced by Literacy before release.
Prior to update 2.0.44, the discount provided by Literacy was 20% instead of 33%.