I didn't realize that coffee beans are actually the berries from the Coffea plant - are you a coffee drinker?
I am a coffee drinker.  It's great!  What is the Coffea plant?
It's the plant that has the coffee beans on it  - they are berries - it was exported from Africa to countries around the world.
I always see Arabica coffee beans on the packaging.  What does that mean?
Arabica beans are the most commonly grown and highly regarded and then there is the less sophisticated but stronger and hardier Robusta 
Oh okay. I have seen that coffee is healthy for you. Is that true?
It is slightly acidic and has a stimulating effect on humans - so too much cannot be good for you.
What is the ideal temperature for making coffee?
I'm not sure of the temperature, except that proper brewing requires correct quantity, extracted to the correct degree, controlled by time and temp.
What is considered to be the most expensive or rarest coffee?