! _Don’t look at the answer, take some time to think, a few days if necessary. The time to build your mental representation of the phenomenon, to formulate it in words is important, a thousand times more important than the ephemeral moment of reading the few words of the solution._
!
! <detailsmarkdown=1>
! <summary>
! CLUE 1 : keywords
! </summary>
! xxx
! </details>
! <detailsmarkdown=1>
! <summary>
! CLUE 2 : trail
! </summary>
! xxx
! </details>
! <detailsmarkdown=1>
! <summary>
! ANSWER
! </summary>
! to write
! </details>
! </details>
!
! -----------
!
! *CHALLENGE n°2* : xxx
!
! An image
!
! The question
!
! <detailsmarkdown=1>
! <summary>
! I choose this challenge
! </summary>
! Information : xxx
!
! _Don’t look at the answer, take some time to think, a few days if necessary. The time to build your mental representation of the phenomenon, to formulate it in words is important, a thousand times more important than the ephemeral moment of reading the few words of the solution._
!
! <detailsmarkdown=1>
! <summary>
! CLUE 1 : keywords
! </summary>
! xxx
! </details>
! <detailsmarkdown=1>
! <summary>
! CLUE 2 : trail
! </summary>
! xxx
! </details>
! <detailsmarkdown=1>
! <summary>
! ANSWER
! </summary>
! to write
! </details>
! </details>
!
! -----------
!
! *CHALLENGE n°3* : A multi touch screen technology (challenge under construction)
!
! -----------
!
! *CHALLENGE n°4* : Luminous fountain (challenge under construction)
!
!!!! *DIFFICULT POINT* (contribute, or indicate a difficult point of understanding)
!!!!
!! *BEYOND* (to contribute)
!!
!! *CULTURAL POINT* (contributor)
!!
!!! *DO YOU MASTER ?*
!!! <detailsmarkdown=1>
!!! <Summary>
!!! Describe the test
!!! </summary>
!!! The text of the test (and its images, figures, audio, video, etc ...)