When do you think a human being will first set foot on Mars? There are daunting technological, biological, psychological, and logistical challenges to be overcome before human explorers can be sent to the planet and returned safely home. Estimates for the departure of the first manned mission to Mars carried out by governmental and/or private entities range from a few years hence to mid-century. So, what do SpaceRip visitors think? Will people arrive there sooner, later, or . . . much later? And, who will get there first?