Astronauts take personal mementos with them into space to help mark the occasion. The tradition started in 1961 when Gus Grissom stashed a roll of dimes in his Mercury flight suit. Since then, personal and historic items – all very small and lightweight – have made trips into space, some going as far as landing on the moon with the Apollo astronauts. What would you take with you into space? What would you take for a friend?