In 2009, I traveled to South Sudan with my organization PSI. While there, I visited a local school and met with a group of children who had formed a water club. The group learned about how to treat their drinking water and use proper hygiene practices, such as washing their hands before eating or after going to the bathroom.

I believe we all share a responsibility to build a healthier, more just and prosperous world.

Robin [Williams], he's pretty dynamic. I had a lot of fun but I also felt like there was no onus on me to be funny.

I learned what love is from loving you.

By preventing pneumonia and other diseases, we are giving men, women and children the chance to live healthy productive lives and participate in the global economy. In doing so, we are not only enhancing their futures - we are enhancing our own.

I've got a crush on you, I hope you feel the way that I do, I get a rush when I'm with you... oh I got a crush on you.

I think it's flattering when people say I'm a role model, but I don't think I am. It depends on your outlook on the word 'role model.' I'm not perfect or anything. I just consider it a great compliment.