1. What element, which Earth’s atmosphere is full of, also makes up half the mass of the Earth’s crust?

2. What resort and film festival did Robert Redford name for his character in a 1969 western?

3. What space shuttle, the third to go into service after Columbia and Challenger, can you visit today at the Smithsonian?

4. What word comes between “Alpha” and “Charlie,” representing the letter ‘B’ in the international radio alphabet?

5. On their album 'FanMail', what trio included “No Scrubs,” “Unpretty,” and the names of thousands of people who’d sent them fan letters?

What’s the "Kennection" between all five answers?