4th installment of The Sagan Series - "Per Aspera Ad Astra"(youtube.com)1 points·by rgower·15 ปีที่แล้ว·0 commentsyoutube.com4th installment of The Sagan Series - "Per Aspera Ad Astra"http://www.youtube.com/watch?v=zxsJeND_D-k0 commentsPost comment—