Navigation applications on a smartphone can be very useful when travelling the groping an address. But how does your smartphone knows where you are; MIT Professor, Wilton L. Virgo, explains how the answer is 20.000 km above our heads, in a satellite has an atomic clock.

3 Comments

1. Christos says:

   10/02/2015 at 14:07

   Το στοιχείο “καίσιο” γράφεται με “αι” όχι με “ε”.

   

   

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   • George Syrkiadis says:

     14/02/2015 at 10:10

     Dude, κι εγώ το τραίνο ακόμα το γράφω με “αι”, αλλά τη γλώσσα όσο πάνε τη σκίζουν… Δυστυχώς

     

     

     Reply
2. Mike says:

   09/02/2015 at 12:06

   well done for subtitling. Many more please.. :)

   

   

   Reply