You speak Greek, You just don't know it

Are you thinking of learning Greek but you have heard that it is one of the most difficult languages? Well, you speak Greek , you just don't know it!
According to the author Aristides Konstantinides, the words of the English language (according to the Webster International dictionary) are 166,724 - of which 41,214 are Greek. Even more impressive, of course, is medical terminology: out of 43716 words, 20346 are Greek. That is, in a total of 178,903 English words, 51,807 (29,24%) come from Greek! Let's see some examples:

Medical terminology ( English) 
διαβήτης                                               diabetes 
στομάχι                                                 stomach
επιδερμίδα                                           epidermis
νεύρο                                                    nerve 
χοληστερόλη                                        cholesterol 
πρωτεΐνη                                              protein
θερμόμετρο                                          thermometer
 
Music 
Μουσική                                               Music
Νότα                                                     Note
Μελωδία                                               Melody
Κιθάρα                                                  Guitar
Πιάνο                                                    Piano
Βιολί                                                     Violin
Τρομπέτα                                             Trumpet 
 
So, as soon as you start learning Greek you will discover that you can guess the meaning of several words just by hearing them!