What's the main difference between the Red and Green Ajahs?

Reds are professional man-hunters. Greens do it for fun.

How many Yellow sisters does it take to change a lightbulb?

None: you can't Heal the dead.

How many Brown sisters does it take to change a lightbulb?

One to look up precedents, one to compile a table of references, and one to record how it gets done - by another Ajah.

How many Red sisters does it take to change a lightbulb?

That's not funny!

How many Blue sisters does it take to change a lightbulb?

None: they manipulate someone else into doing it for them.

How many White sisters does it take to change a lightbulb?

"But how do you know the lightbulb exists, when you only have the evidence of your senses?"

How many Gray sisters does it take to change a lightbulb?

As many as it takes to sign a treaty pledging that the changing of lightbulbs is someone else's responsibility.

How many Green sisters does it take to change a lightbulb?

None. What are Warders for?

So, I guess that leaves the Warders changing all the lightbulbs in the Tower. Poor overworked Gaidin!

Raina's Hold / Raina's Library / Raina's Library - Original Humour