There's new evidence that a woman's levels of female sex hormones, including estrogen and progesterone, can influence her risk of Alzheimer's and other forms of dementia.

Women are less likely to develop dementia later in life if they begin to menstruate earlier, go through menopause later, and have more than one child, researchers reported Monday at the Alzheimer's Association International Conference in Chicago.

President Trump threatened Iran's President Hassan Rouhani in a late-night tweet on Sunday, responding angrily after Rouhani criticized Trump, warned the American president, "don't play with the lion's tail" – and said that "war with Iran is the mother of all wars."

In the battle over the Supreme Court nomination of Brett Kavanaugh, the usual suspects are lining up in support and opposition. At the grass roots, however, there is one new entry nervously eyeing the Kavanaugh nomination. It is March For Our Lives, started by high school students in Parkland, Fla., after the shooting there, and aimed ultimately at enacting more effective gun regulations.

There's a cycle that starts when the snow melts and the earth thaws high in Colorado's Rocky Mountains. It's a seasonal cycle based on timing and temperature, two variables that climate change is pushing increasingly out of sync.

To the outsider, it can be hard to see: Plants still grow, flowers bud, bears awake, and marmots breed. Broad-tailed hummingbirds still trill around a landscape that evokes the opening scene of The Sound of Music, with flowery meadows and granite peaks.