Ngaba ukusela ikofu kungawonyusa umngcipheko womhlaza womntu?

Amagqabantshintshi kwizifundo ezahlukeneyo zeklinikhi kumaqela amakhulu ezigulana ezinomhlaza e-China, e-UK nase-Iran abafumananga mbutho ubalulekileyo phakathi kokusela ikofu (enecaffeine) kunye nomngcipheko owandileyo womhlaza. Nangona, esinye sezifundo zokujonga ...