Three complete books of kindergarten science stories
Small ears are afraid of cold, and winter is here. Mom puts on a thick down jacket, a small hat and a scarf for Mingming, and is going to take Mingming out to visit her grandmother.
Mom walked and asked, "Mingming, is it cold?"
Mingming looked up and said, "Mom, I'm not cold anywhere except my ears. Why? "
Mom smiled and said, "That's because there are peripheral capillaries in the ears." In human body, after blood is pumped out of the heart, it flows along the aorta to the middle artery, arterioles and capillaries. The more you reach the end of the capillary, the less blood, and the less natural energy and heat. Moreover, although the volume of the ear is relatively small compared with other parts of the body, the relative surface area is large, so the heat is easily volatilized. This is why the ears are coldest in winter! "
Obviously, it suddenly dawned on me: "So that's it!"
Mother smiled and nodded, and they walked on, deep and shallow, leaving several rows of footprints, large and small.
Little bear looks for rainbows. It rains a lot in summer. It rained only a few days ago, and it rained again today, but the advantage is that it will be cool after the rain. This is why bears don't hate rain so much.
Soon, the rain stopped and the sky cleared up. "How beautiful! Look! . "Little Bear seems to have found something precious.
"What a fuss!" The little monkey looked in the direction of the bear's finger, and it turned out to be a rainbow. "
"What a beautiful rainbow!" The bear said, "Come on, let's find the rainbow!" " "
"What, looking for a rainbow?" The little monkey feels very fresh.
"That rainbow must be not far from us!"
So the bear and the monkey set out to look for the rainbow. After running a lot of roads, they finally saw the rainbow. Seven colors are shining. The bear and the monkey came to the rainbow and touched it. The chubby rainbow is really cute.
"Hey hey!" Rainbow's body suddenly twisted. "Don't touch me, it itches!" "The rainbow is talking.
"How interesting!" The bear is very happy. "Rainbow is ticklish! Ha ha ha! "
"Do you like the rain very much?" The little monkey asked, "Why do I often see you after the rain!" " "
Rainbow twisted her body again: "It's not that we like rain, but the weather conditions after heavy rain are conducive to our appearance!" " So we can't live without rain! "
The discovery of Neptune Galle and his assistants stayed up until dark, so they were busy aiming their telescopes at that sector. Sure enough, I found a bright spot, which is less than 1 from the position mentioned in the letter. He put his eyes close to the telescope and observed it for an hour. This star really went backwards by 3 seconds. "ouch!" This time director Galle jumped up. The stranger predicted 1 sec! The needle in the sea was finally caught, and Galle and his assistants screamed and hugged each other. A few days later, they announced to the world that they had discovered a new planet! It was named Neptune.
According to this address, Galle found a laboratory, eager to meet the writer named Le Verrier. At this time, a young man of about 30 years old at the table stood up shyly and said, "If I remember correctly, you are Mr. Galle from Berlin, and I am writing to you, Le Verrier." Galle was even more surprised this time. He didn't expect such a young man to lead him to discover Neptune. He threw himself on him, gave him a tight hug, and then couldn't wait to say, "You are so great, so great. Please show me your equipment. "
The young man still smiled shyly, took out a big piece of calculation paper from the drawer and said, "I did it with a pen." "Please introduce your algorithm." "In fact, nothing. I studied the distance between other planets and the sun. Jupiter, Saturn and Uranus have almost the same orbital radius, and the latter is twice as large as the former. Let's assume that the radius of the unknown star is twice that of Uranus and list the equations. Of course, there are also errors between the calculated results and the observed values. After revision, recalculation, revision, recalculation, it is gradually approaching. " "How long has it been?" "I can't remember, it's probably been several years." "So the error is as small as 1 arc second?" "hmm." Le Verrier nodded embarrassedly.
He braved the cold wind and observed under the stars all his life, but it didn't work. However, the young man used a pen to calculate the result. Once scientific hypotheses and theories are established, they have such great power! Exactly: the sea is hard to trawl, and the Ming people follow the trail. Use theory to guide skillfully, not blind people riding blind horses.
Only then did I find out that a young man named Adams had calculated the position of the new star in September exactly one year ago and told the director the result. However, the royal director looked down on the 23-year-old nobody and did not make any serious observation, so that in this important game, the French and the Germans beat him to it (but later in science, people admitted that Neptune was discovered by both of them at the same time, and Le Verrier and Adam became friends. They later served as the directors of the Paris Observatory and the Cambridge University Observatory respectively. The theories of Copernicus and Kepler finally gained a firm foothold because of their great discoveries.
"Copernicus's solar system theory has been a hypothesis for three hundred years, with 99%, 99.9% and 99.99% reliability, but it is a hypothesis after all. When Le Verrier provided data according to this solar system theory, he not only calculated that there must be an unknown planet, but also calculated its position in space. When Galle later discovered the planet, Copernicus' theory was overthrown.