Headlines: "First of all, it's decimal, which is more convenient for recording and calculating. In contrast, imperial units don't even have a unified base system. ”

In fact, in this era, imperial units are not so stupid, or anachronistic.

The main reason is that the measuring tools at this time are relatively rough, the industry is not developed enough, and the various units of measurement are mainly used for market use.

For the occasion of the market, the most important feature of the unit of measurement is that it is easy to divide, such as decimal and hexadecimal, which are very easy to divide numbers, the former can be divisible by two, three, four, and the latter can be divided into three times.

The same is true for the universality of the sexagesimal system, which is divisible by two, three, four, five, six.

The replacement of the metric unit with the traditional unit is because with the development of industrial society, people's realization and requirements for accuracy are getting higher and higher.

"Okay." Gauss didn't say anything more, "Now for the next question, please prove the Pythagorean theorem." ”

Gauss felt that proving the Pythagorean theorem should be the insurmountable limit of the Indians.

Other artillerymen thought so.

If it weren't for the identity of the captives, they might have laughed unabashedly in advance.

Even so, there was still a faint look of expectation on their faces, as if they would soon be able to see the embarrassment when they couldn't answer their forehead lines.

But what happened next was a big surprise to them.

The head print took a pen and paper, and completed the proof of the Pythagorean theorem without saying a word, a schematic diagram, just a few lines.

Moreover, a new method was used to complete a simple and efficient proof with the help of the area of the right-angled trapezoid.

Gauss looked at the brief proof on the paper and his eyes widened in disbelief: "This ...... Who taught you this? ”

"Of course, our Great Chief, the one who just left." "I'm just an ordinary student of the Great Chief. ”

The method used for the forehead tattoo is actually the "presidential testimony" of later generations, which was proposed by US President James Garfield in 1876.

For people in the nineteenth century, proving the Pythagorean theorem was not a big deal, but it was a novel and concise proof, and it earned Garfield some fame.

The president of the United States can still win a good reputation through this, and it is obviously a bit of a miracle that an Indian came up with this evidence.

Looking at the proof in front of him, Gauss fell silent.

He realized that these Indians were really different, much more different than he had imagined.

"Okay...... Now it's your turn. Gauss said a little reluctantly, he had a hunch that he might be in a bad situation.

The head tattoo smiled slightly, and the starting hand was a physics problem.

One of the simplest problems with the law of conservation of energy.

If you ask Ma Whistle to evaluate this question, there is no doubt that it is: send a score question.

However, people in this era are still largely unaware of the law of conservation of energy.

It can't be said that there is none, strictly speaking, this law existed a few years ago.

However, at this time, the law of conservation of energy was not perfect or widespread enough, at least it had not yet become one of the most recognized and fundamental laws of physics.

Top physicists know this law, but the artilleryman, who shares Gauss's name, is clearly not among them.

So when he tried to solve the problem, he just felt that his mind was a mess, and he didn't know where to start, as if it was an unsolvable problem.

He wrote a lot of equations on paper, and when it came down to "x=x" and something like that.

Gauss took a deep breath: "The questioner can't come up with a question that he doesn't know, I think this should be a self-explanatory basic rule, right?" ”

Forehead nodded: "That's right." ”

Gauss asked again, "So, will you do this problem?" ”

Forehead wrinkle: "Of course, it's simple...... You admit you can't do it, right? ”

Gauss was silent for a moment: "Yes...... So, tell me your answer. ”

The forehead tattoo solved the problem three times and divided by two, and in just a few lines, the result was obtained: "This is the law of conservation of energy, in fact, if you pay more attention to the news of physics, you should have heard of it." ”

"Energy...... Conservation? Gauss looked dazed and couldn't understand the concept.

However, this did not prevent him from performing calculations to verify the correctness of the answers.

"You lost, didn't you?" Forehead Tattoo smiled.

"I ......," Gauss was speechless.

Several white artillerymen couldn't help but say, "No, Gauss, you actually lost?" Are you worthy of your last name? ”

"God, you lost to the Indians!"

"Haven't you always been sure about math and physics?"

Gauss grabbed his hair and said distressedly, "I really don't understand this question...... Conservation of energy? What does this mean exactly? ”

"I'm coming!" The other artillerymen couldn't hold back and tried to solve the problem, but the result was as confused as Gauss and could not come up with an answer.

"Whites, do you still think we are illiterate and barbarians?" Or, if we are illiterate and barbarians, what are you? ”

Several artillerymen were speechless.

The mental blow is often heavier than the physical blow.

They can be forced to submit to the barbarians by force, and in their eyes, the barbarians are like beasts, and humans are not ashamed to be defeated by strong beasts.

And now, however, these beasts, who had just defeated them by force, had defeated them with mathematics and physics.

This makes them feel like they have three views shattered.

"Arrogant but stupid white skin, your level of mathematics and physics is lower than I imagined, and you don't even have the qualifications to be a student of the Great Chief!" Forehead Tattoo scorned, he felt that it was more enjoyable than killing an enemy with a bullet.

Several artillerymen were silent for a long time.

"I hope your artillery skills are higher than those of physics, and if you don't even have a skill, you might as well do hard labor honestly." ”

"By the way, I'm willing to gamble and surrender the ten dollars." He held out his hand.

"......" The artillerymen were still speechless, and only after a while did they say, "How can we still have money?" ”

An Apache soldier immediately asked, "Why are you betting if you don't have money?" ”

"I ......" the artillerymen opened their mouths.

Looking up, he glanced at his companions: "Obviously, they think they have a chance to win." ”

Then he said to the whites: "If you don't have any money, then make money first, and the artillery instructor has a salary of twenty dollars a month." ”

Eventually, with mixed feelings, several artillery prisoners became artillery instructors at Fort Sutter, teaching artillery skills to the Apache soldiers.

There are naturally feelings of humiliation and confusion, but it is also inevitable that there will be some comfort and joy.

After all, a monthly salary of twenty dollars is really not low, and who can not be tempted if you earn it.

(End of chapter)