In "Beings Not Made for Space," Kenneth Chang writes about the health challenges of human spaceflight. WHAT are some ways that space affects the human body? WHY is radiation the biggest health hurdle for scientists to solve related to human spaceflight? WHEN does NASA plan to send humans to Mars? HOW long would astronauts most likely spend in space during a mission to Mars? WHAT is the longest any human has been off Earth? HOW did NASA first uncover the problem with eyes in space? WHO is Scott J. Kelly? HOW did NASA solve the problem with bones in space? WHY are there concerns about the human mind for prolonged spaceflight as well? Would you be willing to risk the potential health dangers of human spaceflight for a chance to go to Mars? WHERE would you like to travel to in the solar system or beyond?