What unites us as human beings? French photographer Yann Arthus-Bertrand filmed interviews with more than 2,000 people in 60 countries to answer that ambitious question for his latest project, Human." "For the past 40 years, I have been photographing our planet and its human diversity, and I have the feeling that humanity is not making any progress," Mr. Arthus-Bertrand writes. For more than two years, his crew ... traveled the world, seeking answers. Without any disclosure of location or identity, each subject answers the same 40 questions, including: What is the toughest trial you have had to face, and what did you learn from it? Why are our differences so great? What is your message for the inhabitants of the planet? When is the last time you said "I love you" to your parents? And so on. The result ... is a riveting portrait of life, love, anger, and desire, as told by real-life characters ranging from a laborer in Bangladesh to a death-row inmate in the United States to the former president of Uruguay. Arthus-Bertrand released a web-adapted version of the project on YouTube ... with subtitles available in Arabic, English, French, Portuguese, Russian, and Spanish. "The film speaks to ... the difficulties we each encounter in relation to our own lives, in maintaining valuable connections with our families and those around us and coming to terms with our personal ethics," Arthus-Bertrand says. "The older I get, the more I understand how difficult those objectives are to achieve. But the answer is always love. Love is the answer."