Antonio Mejías-Rentas is a longtime journalist based in Los Angeles. He tweets @lataino.

James Edwards Mills is a freelance journalist, author, outdoor guide, and independent media producer. Mills is the author of The Adventure Gap: Changing the Face of the Outdoors and co-writer/co-producer of the documentary film "An American Ascent."

Kai Mora is an Africanist, historian and writer based in New York. She is the Senior Fellow at the African History Project and a graduate student at the City College of New York.

Dr. Nicholas Morton is an Associate Professor at Nottingham Trent University in the UK. The author or editor of many books and articles, his most recent publication is The Mongol Storm: Making and Breaking Empires in the Medieval Near East (Basic Books).

Chris Mueller is the co-host of the PM Team with Poni and Mueller on Pittsburgh's 93.7 The Fan, Monday-Friday, 2-6 p.m. ET. On Twitter, find him @ChrisMuellerPGH, which is mostly a respository for dog and food pictures.

Kieran Mulvaney is the author of Arctic Passages: Ice, Exploration, and the Battle for Power at the Top of the World, At the Ends of the Earth: A History of the Polar Regions, and The Great White Bear: A Natural & Unnatural History of the Polar Bear. He has also covered boxing for ESPN, Reuters, Showtime and HBO.

Kelli Y. Nakamura is an associate professor of history at Kapi’olani Community College in Honolulu, Hawaii.

Eric Niiler is a science/climate reporter at The Wall Street Journal. His work has also appeared in WIRED, National Geographic, The Washington Post and others.

Nadra Nittle is a veteran journalist who is currently the education reporter for The 19th. Her writing has appeared in The Guardian, NBC News, The Atlantic, Business Insider and other outlets. She is the author of bell hooks' Spiritual Vision and other books.