科学家们利用DNA技术证明所有的人类拥有共同的祖先，为此他们来到人类的摇篮——东非。 　　Scientists use the DNA from a random group of people to show that all humans share common ancestors. On a single day on a single street, with the DNA of just a couple of hundred random people, National Geographic Channel sets out to trace the ancestral footsteps of all humanity. Narrated by Kevin Bacon, The Human Family Tree travels to one of the most diverse corners of the world -- Queens, N.Y. -- to demonstrate how we all share common ancestors who embarked on very different journeys. Regardless of race, nationality or religion, all of us can trace our ancient origin back to the cradle of humanity, East Africa. What did our collective journey look like, and where did it take your specific ancestors? At what point in our past did we first cross paths with the supposed strangers living in our neighbourhood? Now, in The Human Family Tree, the people of this quintessential American melting pot find out that their connections go much deeper than a common ZIP code.

科学家们利用DNA技术证明所有的人类拥有共同的祖先，为此他们来到人类的摇篮——东非。 　　Scientists use the DNA from a random group of people to show that all humans share common ancestors. On a single day on a single street, with the DNA of just a couple of hundred random people, National Geographic Channel sets out to trace the ancestral footsteps of all humanity. Narrated by Kevin Bacon, The Human Family Tree travels to one of the most diverse corners of the world -- Queens, N.Y. -- to demonstrate how we all share common ancestors who embarked on very different journeys. Regardless of race, nationality or religion, all of us can trace our ancient origin back to the cradle of humanity, East Africa. What did our collective journey look like, and where did it take your specific ancestors? At what point in our past did we first cross paths with the supposed strangers living in our neighbourhood? Now, in The Human Family Tree, the people of this quintessential American melting pot find out that their connections go much deeper than a common ZIP code.

Using information from the investigation following the dropping of the first atomic bomb on Hiroshima on August 6, 1945, this documentary outlines the immediate 24 hours following the massive explosion. The first atomic bomb contained 140 lbs of enriched uranium and reduced the downtown to a wasteland with 70,000 people killed immediately. Another 40,000 died three days later when a second bomb was dropped on Nagasaki. The Army spent 10 weeks studying the impact of the explosion focusing on thermal flash. The immediate impact was that some were vaporized leaving only atomic shadows. Triangulating these led them to conclude that the bomb exploded only a few hundred yards from its intended target. There was heavy damage for 3 miles in every direction. A great many were burned but there was very little information about radiation poisoning at the time. Today, scientists are still studying but the study continues today with the study of 120,000 Hiroshima survivors.

Using information from the investigation following the dropping of the first atomic bomb on Hiroshima on August 6, 1945, this documentary outlines the immediate 24 hours following the massive explosion. The first atomic bomb contained 140 lbs of enriched uranium and reduced the downtown to a wasteland with 70,000 people killed immediately. Another 40,000 died three days later when a second bomb was dropped on Nagasaki. The Army spent 10 weeks studying the impact of the explosion focusing on thermal flash. The immediate impact was that some were vaporized leaving only atomic shadows. Triangulating these led them to conclude that the bomb exploded only a few hundred yards from its intended target. There was heavy damage for 3 miles in every direction. A great many were burned but there was very little information about radiation poisoning at the time. Today, scientists are still studying but the study continues today with the study of 120,000 Hiroshima survivors.

天朝国家地理

天朝国家地理

简介：在原始的印度丛林里，独行狩猎的老虎在其各自的领域称王。让我们跟着镜头捕捉它的神秘踪迹，观赏勇猛迅捷的它在狩猎时是如何潜近、埋伏与偷袭猎物，以及在老虎国度里，许多野生动物之间互相掠食的关系。片中，您亦将看见其等待猎物时超凡的耐心和照顾幼虎时细心温柔的一面。请您一同深入虎域遨游，尽情欣赏丛林之王的赫赫英姿。

简介：在原始的印度丛林里，独行狩猎的老虎在其各自的领域称王。让我们跟着镜头捕捉它的神秘踪迹，观赏勇猛迅捷的它在狩猎时是如何潜近、埋伏与偷袭猎物，以及在老虎国度里，许多野生动物之间互相掠食的关系。片中，您亦将看见其等待猎物时超凡的耐心和照顾幼虎时细心温柔的一面。请您一同深入虎域遨游，尽情欣赏丛林之王的赫赫英姿。

北极狼群荒野生活的亲密纪录 　　加拿大的埃尔斯米尔岛，距离北极不到五百哩。在这酷寒的极地，只有极特殊的动物才能生存，白狼就是其中之一。在世上其他地区，狼群饱受人类的迫害而对人类深怀戒心，难以靠近观察。然而此地人迹罕至，白狼徜徉在冰冷荒原上悠然自得，对人类毫不畏惧。国家地理摄影师吉姆．布兰登勃格与研究狼群三十年的生物学家戴夫．米奇连袂前往此岛，在极为恶劣的环境下，拍摄了有史以来对狼群观察最细致、最亲密的生态纪录片

北极狼群荒野生活的亲密纪录 　　加拿大的埃尔斯米尔岛，距离北极不到五百哩。在这酷寒的极地，只有极特殊的动物才能生存，白狼就是其中之一。在世上其他地区，狼群饱受人类的迫害而对人类深怀戒心，难以靠近观察。然而此地人迹罕至，白狼徜徉在冰冷荒原上悠然自得，对人类毫不畏惧。国家地理摄影师吉姆．布兰登勃格与研究狼群三十年的生物学家戴夫．米奇连袂前往此岛，在极为恶劣的环境下，拍摄了有史以来对狼群观察最细致、最亲密的生态纪录片