The teaching assistant for Controversies In Cosmology is Chippu.

Jason’s rules for teaching assistants

When the teaching assistant is thrown at you:

• If you fail to catch the teaching assistant, you must report back on a group discussion, or answer a question, or otherwise contribute to the class.

• If you catch the teaching assistant, you may throw him on to someone else.

The point of this is that it gives you an incentive to try to catch the TA. Otherwise the class can end up as a game of Dodgeball.