More photographs, this time accompanied by interviews, from the creator of the blog and the book “Humans of New York.”

How Homo sapiens became Earth’s dominant species.

NBC’s chief foreign correspondent discusses the Arab Spring and war in the Middle East.

The mother of one of the Columbine shooters wrestles with her grief and guilt and discusses how parents can become more aware of the signs of mental illness in teenagers.

A mother tells the story of her once-sickly daughter, whose chronic ailments disappeared after a near-death experience.

In the current era, entrepreneurs will use technology to revolutionize various sectors of the economy.

A geobiologist shares her fascination with plants and describes how she found her vocation.

The 10 first ladies since 1960, based on interviews with White House staff, social secretaries and friends.

The co-anchor of “World News Tonight” and “20/20” describes her long struggle with acute anxiety and panic attacks, which she attempted to medicate with alcohol.

The radio host discusses what will happen after the administration of “President Maobama.”

An attack on Hillary Clinton focused on her use of a private email server and the activities of the Clinton Foundation.

The anchor of Fox News’s “The Kelly File” discusses why she left a succesful career as a lawyer, the value of hard work, the personal and professional challenges she has faced.

The Vermont senator and former candidate for the Democratic nomination for president delivers his message. of social and economic justice.

Autobiographical essays by the young actress.

A memoir about growing up in South Africa by the comedian, now the host of “The Daily Show,” whose birth was the result of an illegal (under apartheid) relationship between a white Swiss father and a black Xhosa mother.

Scientific (but often humorous) answers to hypothetical questions, based in part on the author’s website, xkcd.com.

More personal essays from the comedian and actress.

An account of the Salem witch trials of 1692.

A memoir by the singer.

A former C.I.A. director defends his policies.

Imagining the contemporary world as it will appear to those for whom it will be the distant past.

Personal essays, mostly humorous by the YouTube celebrity.

The author says progressive politicians gain power and control by exploiting Americans’ fears.

An in-depth look at the presidential nominee, drawing on decades of coverage.

The attempt in the closing days of World War II to rescue purebred horses raised for Hitler.

Burnett looks back on “The Carol Burnett Show” (1967-78), describing sketches and favorite guests as well as directors, musicians and members of the crew.

The further adventures of the TV producer and personality.

How the accelerating pace of technology, globalization and climate change are reshaping the world, and what we can do about it.

An oral history of the show, based on extensive interviews with Jon Stewart and others.

An eyewitness account of Pearl Harbor by a 94-year-old veteran.