The time when whales walked - evolution of whales | Prof TRACEY ROGERS 動画 YouTube https://www.youtube.com/watch?v=btXMKN-SI48 Why did whales return to the sea? Why did whales return to the sea? To make a living NCPR News Jun 09, 2016 - W…

The Big Bang: The Shape of the Universe 動画 YouTube https://www.youtube.com/watch?v=zhfT77KhhTw Geometry of the Universe What shape is the Universe, really? The Universe is flat, according to modern research. But what does that mean? http…