Misc: What's the international radio code word for the letter "E"?

Questions

The housefly hums in the middle octave, key of?

The only capital letter in the Roman alphabet with exactly one endpoint is?

The longest time someone has typed on a typewriter continuously is ____ hours, set by Violet Gibson Burns?

Hydroxydesoxycorticosterone and hydroxydeoxycorticosterones are the largest?

Only one person in two billion will live to be ___ or older?