YOU SAID:
Who's pooped in the past 50 millenia
INTO JAPANESE
過去50年間で誰がうんちをしたのか
BACK INTO ENGLISH
Who pooped in the last 50 years
INTO JAPANESE
過去50年間に誰がうんちした
BACK INTO ENGLISH
Who has pooped in the last 50 years
INTO JAPANESE
過去50年間で誰がうんちした
BACK INTO ENGLISH
Who pooped in the last 50 years
INTO JAPANESE
過去50年間に誰がうんちした
BACK INTO ENGLISH
Who has pooped in the last 50 years
INTO JAPANESE
過去50年間で誰がうんちした
it is unlikely that this phrase will ever reach equilibrium