2036 (MMXXXVI) will be a leap year starting on Tuesday of the Gregorian calendar.

John Titor is the name used on several bulletin boards during 2000 and 2001 by a poster claiming to be a time traveler from the year 2036. In these posts he made numerous predictions (a number of them vague, some quite specific) about events in the near future, starting with events in 2004. However, as of 2012, these events appear not to have taken place; he described a drastically changed future in which the United States had broken into five smaller regions, the environment and infrastructure had been devastated by a nuclear attack, and most other world powers had been destroyed.

To date, the story has been retold on numerous web sites, in a book, and in a play. He has also been discussed occasionally on the radio show Coast to Coast AM. In this respect, the Titor story may be unique in terms of broad appeal from an originally limited medium, an Internet discussion board.

The first post appeared on the Time Travel Institute forums on November 2, 2000, under the name TimeTravel_0. At the time the posts had nothing to do with future events and the name "John Titor" was not being used. Instead, the posts discussed time travel in general, the first one being the "six parts" description of what a time machine would need to have to work (see below) and responses to questions about how such a machine would work. Early messages tended to be short.

Neil deGrasse Tyson ( /ˈniːəl dəˈɡræs ˈtaɪsən/ born October 5, 1958) is an American astrophysicist and science communicator. He is currently the Frederick P. Rose Director of the Hayden Planetarium at the Rose Center for Earth and Space, and a research associate in the department of astrophysics at the American Museum of Natural History. Since 2006 he has hosted the educational science television show NOVA scienceNOW on PBS, and has been a frequent guest on The Daily Show, The Colbert Report, Real Time with Bill Maher, and Jeopardy!. It was announced on August 5, 2011, that Tyson will be hosting a new sequel to Carl Sagan's Cosmos: A Personal Voyage television series.

Tyson was born as the second of three children in the borough of Manhattan in New York City, but was raised in the Bronx. His mother, Sunchita Feliciano Tyson, was a gerontologist and his father, Cyril deGrasse Tyson, was a sociologist, human resource commissioner for the New York City mayor, John Lindsay, and was the first Director of HARYOU. Tyson attended the Bronx High School of Science (1972–1976, astrophysics emphasis) where he was captain of the wrestling team and was editor-in-chief of the school's Physical Science Journal. Tyson had an abiding interest in astronomy from the age of eleven, following his visit to the Hayden Planetarium at age nine. Tyson recalls that "so strong was that imprint [of the night sky] that I'm certain that I had no choice in the matter, that in fact, the universe called me." He obsessively studied astronomy in his teens, and eventually even gained some fame in the astronomy community by giving lectures on the subject at the age of fifteen.