Getting to Mars: The Hohmann Transfer

How long does it take to get to Mars? What Delta-Vs are required? When should you launch and why is a one way trip easier than a return mission? Mars One Astronaut Candidate Ryan MacDonald explains the Hohmann Transfer orbit. *Part 1 (Orbital Mechanics 101): https://www.youtube.com/watch?v=VGcQhgkXPx0