Although the chemistry of autumn colours is well understood, there is an ongoing debate among scientists about why trees evolved their vivid autumn colours in the first place.

Not counting his golf outings in Virginia, President Trump spent all or part of 14 days outside of Washington, D.C. during the first 31 days of the shutdown.

We met five remarkable people who’ve lived for more than a century and have yet to retire. For them, a working life is a richer one.