ሳይንስሳይንስን የሚያስተዋውቁት ውድድሮችTo play this audio please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoሳይንስTesfalem Waldyes Erago25 ታኅሣሥ 2010ረቡዕ፣ ታኅሣሥ 25 2010https://p.dw.com/p/2qJ5Qማስታወቂያ