This hour, a potpourri of topics.

First, some new thinking around dental cavities — are they really an oral microbiome problem?

And, as we endure another record-setting fire season, scientists are wondering, does Smokey Bear need a makeover?

Finally, what happens if we look at Earth as an exoplanet?

GUESTS:

• Jaime Green - Associate editor of Future Tense
• Maggie Koerth - Senior science writer for FiveThirtyEight
• Jennifer Oldham - Pulitzer Prize-winning reporter