January 2016: French students aged 17 offer presentations about the very first numbers in humanity. These videos are school excercises in class as an oral test in groups. Can you answer the following questions?

group 1:   https://www.youtube.com/watch?v=J8LUVAF7FaY

group 2:   https://www.youtube.com/watch?v=_8Rmgxx7x9s

group 3:  https://www.youtube.com/watch?v=7ipj8pxuSz8

group 4:  https://www.youtube.com/watch?v=bdzLhFOz3dw

Questions:

1. When, where and why the need for numbers and symbols did appear to humans?

2. Describe the Egyptian number system? Advantages and disadvantages compared to our number system today.

3. When, where and why did the Babylonians invent their own number system?

4. Describe the Babylonian number system? Advantages and disadvantages compared to our number system today.

5. What is the major consequence of this Babylonian number system for mankind?