Why can't a helicopter fly to the top of Everest?

Related questions

1. Can you drive to Everest Base Camp?
2. Can you climb Mount Everest without a guide?
3. How cold is it at the top of Mount Everest right now?
4. Is it hard to climb Mt Everest?
5. How difficult is base camp Everest?
6. How many bodies are left on Mount Everest?
7. Which of the 7 summits is easiest?
8. Was ant Middleton in the SAS?
9. Has anyone got to the top of Mount Everest?
10. What happens to your body in the death zone?

Tags

1. #everest
2. #atleast
3. #thinner
4. #times
5. #forward
6. #approximately
7. #would
8. #helicopter
9. #hence
10. #altitudes
11. #cannot
12. #blades
13. #someone