ሳይንስየሰው ልጅ ጨረቃ የረገጠበት 50ኛ መታሰቢያTo play this audio please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoሳይንስTesfalem Waldyes Erago10 ሐምሌ 2011ረቡዕ፣ ሐምሌ 10 2011https://p.dw.com/p/3MDXcማስታወቂያ