Slate human guinea pig Emily Yoffe goes head-to-head with a world-famous competitive eating champion, as she competes in this year's matzo ball-eating contest in New York City. This is DAY TO DAY from ...

This is DAY TO DAY from NPR News. I'm Madeleine Brand. Every few months, we check in with Slate's Emily Yoffe, better known by her nickname the Human Guinea Pig. She takes on tasks most of us would ...