Two science leaders at same time

[Ric Flair]

Hello,
I am currently playing a game as the Persians (for the first time) where I discovered Philosophy (thereby receiving a Science leader) and then after picking Monarchy, received another Science leader within the same turn.

How common an occurrence is this?

 

[justanick]

The chance for an SGL is assumed to be 3% for regular Civs and 5% for scientific Civs. If so the chance would be 0.09% for regular Civs and 0.25% for your scientific civ. This already assumes that both techs have not been researched by anyone else.

 

[Kirejara]

It happens not often, but it is not uncommon.

In the "Interesting Screenshots" thread is a picture from one of my games, there I had three (or four?) leaders in a row without a wonder to build left (Hoover Dam was still open, but without a single river on the map... ).