Five Best Ideas of the Day: January 30

1. What if football helmet safety ratings are measuring the wrong hits?

By Bryan Gruley in Bloomberg Business

2. If France wants fewer radicalized Muslims, it must clean up its prisons.

By Michael Birnbaum in the Washington Post

3. They 3D-printed a car.

By Umair Irfan in Scientific American

4. The low price of meat doesn’t reflect its true cost.

By the New Scientist

5. Lesser-known cities and young architects are perfect for each other.

By Amanda Kolson Hurley in CityLab

The Aspen Institute is an educational and policy studies organization based in Washington, D.C.