Why octopuses are smarter than we thought
There are two important reference standards for looking at the intelligence of an animal: brain-body ratio and number of neurons. Octopuses also have brains, and their brains are also in their heads. If we simply look at the ratio of the brain in the head to the body, the octopus will be weak, because the largest part of its body is actually its tentacles. However, one thing needs to be noted, that is, the intelligence of the brain is related to the number of neurons. Our human neurons are concentrated in the brain, but the octopus's brain actually has only 40% of neurons, and the remaining 60% of neurons are in its 8 tentacles.
The evolutionary history of octopuses
Why didn't such a smart octopus reach the top of the food chain?
Summary
-
Popular ScienceDeep-sea discoveries reveal ancient secrets
Students who love ancient civilizations should know that the earliest human civilization is believed to have originated from the Sumerians in the Mesopotamian Basin. The Sumerian civilization, which invented cuneiform, is about 8,000 years old. After more than 3,000 years, it was replaced by the Babylonian civilization. However, at the end of the last century, an underwater relic discovered near the Ryukyu Islands in Japan is likely to completely subvert the cognition of human civilization.What secrets are hidden in this suspicious deep-sea relic? In the southernmost part of Japan, further south than Okinawa Island, there is a small island called Yonaguni. The island is located at the westernmost end of the Yaeyama Islands in the Ryukyu Islands. From the map, it is on the edge of the continental shelf, only one step away from Taiwan Island. Yonaguni Island has an area of about 28.88 square kilometers, a coastline of about 28 kilometers, a population of about 1,745, and an average annual temperature of 23.9℃. Due to the strong southerly wind blowing on the island all year round, the erosion of the southern coast is more obvious, and most of them are cliffs. Nishizaki in the west is the westernmost cape of Japan, and there is a monument that reads "Japan - the westernmost place - Yonaguni Island".
-
Popular ScienceThe Arctic Is Melting Faster Than Expected
The Arctic could see its first ice-free summer day by 2027, exacerbating global warming and extreme weather. The Arctic could see its first summer as early as 2027, with nearly all of its sea ice melted away — a troubling milestone for the planet. For the first time, an international team of researchers, led by the University of Colorado and the University of Gothenburg in Sweden, used computer models to predict when the northernmost ocean would see its first ice-free day. An ice-free Arctic could have major impacts on ecosystems and Earth’s climate by altering weather patterns.
-
Popular ScienceIs smell your most powerful memory trigger?
Have you ever had a smell that has touched you so deeply that you still can't forget it? I believe many people have had such an experience. In fact, 75% of human emotions are closely connected to the sense of smell, which can be called a loyal guardian of memory. Each smell may carry a unique memory story, and they are like a portal in time, leading us to travel through time and space and return to the past.
