Big Bang Theory questions

1) For what reason did Penny arrive at Leonard's and Sheldon's apartment?
To give them their Christmas presents.

2) What does Penny give to Sheldon?
A napkin with Leonard Nimoy's signature.

3) Who's DNA is on Sheldon's gift?
Leonard Nimoy's

4) What does Sheldon plan to do with the DNA?
grow is own Leonard Nimoy.

5) Leonard received what as his gift? What is lesson one?
A motorcycle lesson. Falling off the bike.

6) Sheldon, thinking that his gifts are not enough to thank penny, does what?
Hugs Penny.

7) How would you describe Sheldon?
he is someone that doesn't really like people.

Bonus: Who is Leonard Nimoy?
He is an American actor, film director, poet, singer and photographer.

How many cell phones are there?

1) How many cell phones are there per person in the world?
roughly 1 per person. 
2) What are the differences in different countries? Can you comment some specific cases?
There are some that have over 100% and others that have less. Russia for example has 160% and India 73.1%
3) What will happen in the future?
That there will be more phones than people in the world. 
4) How is it that we can speak on a mobile phone without hearing other conversations from other people?
Because of technology innovations, using different methods.