Ava Wallace, sports reporter at The Washington Post, is in France to report on the Summer Games — and eat a lot of croissants. Join her through the entire run of the games, for several episodes a week as she captures the highs, the lows and the Paris of it all, along with other Post colleagues.

Lillian Cunningham begins her journey in the place that helped inspire the national parks. As wildfires threaten Yosemite’s giant sequoias, she asks how to ensure the survival of these ancient trees. Follow "Field Trip" to hear the whole series.