Penny's Christmas Gift to Sheldon

1) For what reason did Penny arrive at Leonard's and Sheldon's apartment?

Because she give and recive presents.

2) What does Penny give to Sheldon?

A napkin with a Leonard Nimoy signature.

3) Who's DNA is on Sheldon gift?

Leonard Nimoy

4) What does Sheldon plan to do with the DNA?

Create a new Leonard Nimoy

5) Leonard received what as his gift? What is lesson one?

A motorbike lessons,  and not fall off the motor bike before starting.

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

 Sheldon planned to have multiple presents ready for Penny so he could give her a present equal in value to the one she gave him.

7) How would you describe Sheldon?

Is a very inteligent man but is a bit nervous and extressed, is a very good friend and is very generous.

*Bonus: Who is Leonard Nimoy?

Is a protagonist of the very popular film Star Trek interpreting Spock.

How many cell phones are there?

How many cell phones are there per person in the world?

6/7 because in the world are 7 billions and 6 billions mobile subscriptions.

What are the differences in different countries? Can you comment some specific cases?

Russia for example is the highest and gremany. I think  the most developed countries have  the highest  rate.

What will happen in the future?

In the future the number of the mobiles subscriptions will rise.

How is it that we can speak on a mobile phone without hearing other conversations from other people?

because each subscription have a number and all the people have to share the air.