The change did not happen overnight. It built slowly, one conversation and one decision at a time, until it was simply how things were done.

Heat changes everything here. Hydrate early and plan activity for the cooler parts of the day.

Common mistakes

The change did not happen overnight. It built slowly, one conversation and one decision at a time, until it was simply how things were done.

Heat changes everything here. Hydrate early and plan activity for the cooler parts of the day.

The numbers tell part of the story. The people behind them tell the rest, and they are usually more interesting.

People are smarter about this than companies give them credit for.

Experts we spoke to were careful to say that conditions vary by region, by income and by season, so treat these as starting points.