 Eeg wajiga qofka gaar ahaan indhihiisa: Marka aad qofka wada sheekaysanaysaan isku day inaad eegto qofka wajigiisa gaar ahaan indhihiisa, Cilmi baadhis lagu sameeyay jaamacadda Harvard ee dalka Mareynkanka, in lamaanaha aadka isku jecel ay is eegaan 70 ka mid ah waqtigooda marka ay wada sheekaysanayaan. 