Astronomers have now found thousands of planets orbiting other stars in the Milky Way, and 100 billion more stars in the galaxy presumably host planets of their own. Given the sheer number
of worlds … 続きを読む →
Dolphins name one another, and they click and whistle about their lives or the dangers posed by sharks and humans.
They also pass on useful bits of know-how from mother to child, such as how to catc … 続きを読む →