大自然中 ,许多动物都“精通”数学。珊瑚虫能在自己身上奇妙地记下“日历” :它的每年在自己的体壁上“刻画”出 36 5条环纹 ,显然是一天“画”一条。奇怪的是 ,古生物学家发现 ,3亿 5千万年前的珊瑚虫每年所“画”出的环纹是 4 0 0条。天文学家告诉我们 ,当时的地球一天只有 2 1.9小时 ,一年不是 36 5天 ,而是 4 0 In nature, many animals are “proficient” in mathematics. The coral can magically record the “calendar” on its own: it annually “paints” 36 5 rings on its body wall, apparently “painting” one day. What is strange is that paleontologists have discovered that 400 million years ago corals had 400 rings painted each year. Astronomers told us that at that time, the Earth was only 2 1.9 hours a day. The year was not 36 5 days, but 4 0