How did john glenn make this world a better place?

What does the Tiresias predict will happen if Odysseus raids the herds of Helios? The line of longitude used as the origin in the system of coordinates? Why on some occasions you can see the planets line up in the sky? When was the first lunar landing? How many days a year of sunshine does Denver get? Did any Russians go to the moon? Why do astronauts train fir the weightlessness of space underwater? What can I see through a 50mm telescope"? What do you look like right now? Are clouds a example of plasma? Who reached Antarctica first Roald Amudsen or Robert Falcon Scott? Are some stars invisible because the sun is so hot? Activities present in the phases of copar? What is the gravity percentage on the moon? What is the procedure for focusing a microscope using the coarse and fine adjustment knobs? Where are the eyes of Albert Einstein? When the moon is not round where can the missing bit be found? How does it feel when you land on the moon? Why couldn't valentina tereshkova go back into space? What is Edwin Aldrin's nickname?