Jean didn't like being laughed at. Sometimes it made her very tempted to use her powers to alter the minds of others so they wouldn't laugh at her anymore. Professor Xavier warned her that she needed to control her power or it would consume her.
After Rogue finally left, she finished off her lunch even though she wasn't that hungry. Her stomach was feeling a little queasy from all the intense work she was doing. At least, that was the reason she gave herself for why she felt strange.
Returning to work, she made some headway into her research. Setting up some computer simulations, she let them run. It got boring watching them run, so she went about setting up some practical tests.