Five Best Ideas of the Day: December 20, 2017 - The Aspen Institute

No, really this time, a cure for the common cold.

Päivi Lehtinen at the University of Helsinki
Stop drinking diet soda.

Jacqueline Howard at CNN
Unlocking the secrets of ‘aha moments’ to discover better ways of learning.

Jeff Grabmeier at the Ohio State University
Why Americans are leaving the cities again.

Derek Thompson in the Atlantic
Here’s how to make sure you’ll actually go to the gym.

Cari Romm in the Cut