Mu mpera za Xyili, Ivan Pavlov yaje gufata umwanzuro ko ubwoko butandukanye bwibiryoguswera hamwe nubufasha bwa enzymes zitandukanye no mumashami atandukanye...
Mu mpera za Nyakanga, kurasa kwumwaka mushya "igiti-5" cyarangiye muri St. Petersburg. byamenye ibisobanuro."Buri mwaka mu cyi, iyo bishyushye kumuhanda...
Izi nzis zose zagumye mu kinyejana cya XIX. Uyu munsi ntabwo ari ibintu bifatika. Kuva abantu 60 bo mu kinyejana cya xx, icyerekezo cyatangiriye ku ishusho...