هذه المقاطع توضح باختصار لغز انقراض الديناصورات
والعوامل التى ادت الى ذلك
الجزء الاول :-http://tc.v17.cache8.c.youtube.com/videoplayback?ip=0.0.0.0&sparams=id%2Cexpire%2Cip%2Cipbits%2Citag%2Calgorithm%2Cburst%2Cfactor%2Coc%3AU0dXTlhSVF9FSkNNN19QTFhF&fexp=909001&algorithm=throttle-factor&itag=18&ipbits=0&burst=40&sver=3&expire=1289876400&key=yt1&signature=AAB1C6EC4069FE9176D10B36377551FFF9450702.52E2145E3CCE062BC298BF16304E480D02CD4CB9&factor=1.25&id=13739153d0a840a9&redirect_counter=1
الجزء الثانى :-
http://v6.lscache6.c.youtube.com/videoplayback?ip=0.0.0.0&sparams=id%2Cexpire%2Cip%2Cipbits%2Citag%2Calgorithm%2Cburst%2Cfactor%2Coc%3AU0dXTlhNV19FSkNNN19QR0FH&fexp=909001&algorithm=throttle-factor&itag=18&ipbits=0&burst=40&sver=3&expire=1289829600&key=yt1&signature=9788506E1B3755EBD6EE9D564DF91EBBB1D24994.466E777213A61E8810C60DEA09834A060848B1E5&factor=1.25&id=9ccc314cffc14d86&