the great hornbill also known as the concave-casqued hornbill, great indian hornbill or great pied hornbill. - 凹的 個影片檔及 b 捲影像00:10
the great hornbill also known as the concave-casqued hornbill, great indian hornbill or great pied hornbill. - 凹的 個影片檔及 b 捲影像00:05
how to bend light - part 13 of 18. proof that light travels in straight lines; that it can be bent by reflection and refraction; that we can see objects because light hits them and is reflected back to our eyes is demonstrated - 凹的 個影片檔及 b 捲影像00:35
how to bend light - part 12 of 18. proof that light travels in straight lines; that it can be bent by reflection and refraction; that we can see objects because light hits them and is reflected back to our eyes is demonstrated - 凹的 個影片檔及 b 捲影像00:36
how to bend light - part 11 of 18. proof that light travels in straight lines; that it can be bent by reflection and refraction; that we can see objects because light hits them and is reflected back to our eyes is demonstrated - 凹的 個影片檔及 b 捲影像00:35
light science: you can do it! - part 20 of 21. a magician can create illusions by manipulating light. his secret lies in his understanding of light's properties - characteristics that young scientists can learn through this entertaining film's easy-to-dup - 凹的 個影片檔及 b 捲影像00:33
light science: you can do it! - part 13 of 21. a magician can create illusions by manipulating light. his secret lies in his understanding of light's properties - characteristics that young scientists can learn through this entertaining film's easy-to-dup - 凹的 個影片檔及 b 捲影像00:35
light science: you can do it! - part 12 of 21. a magician can create illusions by manipulating light. his secret lies in his understanding of light's properties - characteristics that young scientists can learn through this entertaining film's easy-to-dup - 凹的 個影片檔及 b 捲影像00:36彎腰
