Walls VS Sandbags: Contrasts from Jack's Personal Experience
On the battlefield full of artillery fire, Jack and recruit Xiao Wang squatted in the crater, and the noisy gunfire was mixed with screams one after another. "Don't lean against the wall!" Jack grabbed Xiao Wang, who was about to move towards the base of the wall, and said solemnly.
Xiao Wang looked suspiciously at the cement wall standing in front of him, puzzled by the reason. This wall seems to be strong and reliable, but isn't it the best cover in the face of a rain of bullets?
Jack seemed to guess Xiao Wang's doubts, stared ahead with complicated eyes, and slowly spoke: "I used to think so, until the blood of my teammates splashed on my face......" The tone was vicissitudes and melancholy.
It turned out that Jack witnessed his comrades accidentally leaning against the base of the wall, and a bullet easily pierced through the wall, and the splashed bricks took the lives of his comrades. "I'll never forget the last time he stared at me. The corners of Jack's eyes flushed slightly.
Xiao Wang sighed when he heard this, and doubts rose in his heart: Is it so easy for a bullet to penetrate the wall? So Jack talked about a foreign experiment he had seen: at 15 meters, an ordinary pistol could easily pass through a hardness brick; It can also be penetrated at 25 meters.
This result finally shattered Xiao Wang's last trace of illusion - the original hard wall could not stop the rapid movement of bullets at all.
As soon as the conversation changed, Jack looked solemn and continued: "I have seen even more terrifying pictures later. The enemy's machine gun fire hit the tin roof, which was pierced like a piece of paper, and all the comrades in the house were killed.
All kinds of personal experiences have made Jack firmly conclude: in this cruel battlefield, only sandbags are the last hope against the rain of bullets...... Next, he will explain to Xiao Wang why the seemingly soft sand has such strange powers.
The Mystery of Sand: The Counterattack of Non-Newtonian Fluids
After listening to Jack's experience, Xiao Wang couldn't help but ask: "What is the origin of this sandbag, and how can it block that deadly warhead?"
Jack seemed to be prepared, took out a small bag of sand from his pocket and slowly poured it into the palm of his hand: "This is the life talisman that I must prepare on every battlefield - it seems soft, but it has amazing power.
He first grabbed a small pinch of sand and held it gently, and the sand slipped through his fingers; Then he slammed his grip, and the sand was firmly reunited, and it did not move. "My teacher demonstrated to me such an experiment, and the sand seemed to have a magical 'strong when it is strong' property. Jack said.
It turns out that sand belongs to a strange group of substances called "non-Newtonian fluids". Dough, egg whites, and even many liquids in the human body all have this dual nature of solid and liquid.
"Imagine that you gently poke the dough with your hand and can easily insert it; But when I smashed it hard, the dough was as hard as iron, and I didn't let it go at all. That's the magic of non-Newtonian fluids.
Jack grabbed the stone from the ground and slammed it on the sand in front of him, and the sand burst out and quickly solidified and recovered. "The sand can instantly increase its resistance under high-speed impact, and this 'strong when it is strong' characteristic makes it easy to stop the penetration of bullets and keep death out.
In addition, Jack also explained in detail the reduction of the reaction force and the suppression of the cavity effect, which gave Xiao Wang a deeper understanding of the basic laws in physics.
"Each of us also has such a miraculous liquid flowing in our bodies - in the face of gunshot wounds, it can solidify in time and win us a chance to survive. This is the mystery in the blood......" said Jack, stroking the old wound on his left arm.
The versatile use of sandbags
In addition to bulletproof, sandbags are also powerful on the battlefield. Jack pointed to the trenches and fortifications not far away, and introduced to Xiao Wang: "With just a few sandbags, you can quickly build strongholds and bunkers, which are indispensable when preparing for battle.
He picked up a bag of sand and walked to Xiao Wang, and pulled the bag open with both hands: "The sandbag is easy to fill, and you only need to pour the sand into the protective net to build the fortifications, which is both trouble-free and environmentally friendly."
With that, he poured out half of the sand and simulated the fortified line that had been erected.
Xiao Wang still seemed to be suspicious: "But this fortification doesn't seem to be very strong?" Jack smiled bitterly when he heard this, and patted the surface of the sandbag: "Don't underestimate it, under high density, this sand will condense into a hard stone, which can resist artillery bombardment for soldiers!" The confidence in these words finally dispelled Xiao Wang's last concerns.
Jack pointed to the sandbag beside him, "This is an artifact that protects life." When the explosion is spatter, it shields you from damage. Hiding behind a sandbag and firing a gun can not only prevent excessive recoil of the machine gun, but also improve stability and accuracy!" As he spoke, he pretended to carry a machine gun and fired into the air, and his posture was standard and smooth.
Finally, Jack pointed to the charred sandbags in the sea of fire and sighed: "Even in a raging fire, this sand plays a huge role - it blocks oxygen and restricts the spread of fire."
This scene opened Xiao Wang's eyes, it turned out that the yellow sand that suddenly stood up not only showed his magic on the battlefield, but also contributed to the disaster relief accident.
Under all kinds of examples, Xiao Wang finally realized that this inconspicuous sand is tougher than steel and more powerful than metal. It saves not only lives, but also hope.
The truth of overcoming rigidity: Xiao Wang's transformation
Jack's argument finally opened the shackles of Xiao Wang's thinking. It turns out that the hardness on the outside does not mean the inner strength, but the soft sand is the true meaning of strength.
"yes, I'm so arrogant. Xiao Wang covered his face with remorse, "Just now I swore that the cement wall could protect me, but I didn't know that I had no power to fight back."
Jack patted Xiao Wang's shoulder approvingly: "It's good to know that mistakes can be corrected! When I first went to the battlefield, I was also empty-eyed, and I almost lost my life." Fortunately, the teachings of the veterans made me recognize the cruelty of reality and understand the unique charm of sand that is soft and rigid, rigid and soft.
Yes, the sand is extremely soft on the surface, and it can be held in a few clicks; But with a little compaction, it can turn into a strong King Kong, beyond imagination. "This is the source of strength that I draw from every life-and-death battle, and it is also the spiritual pillar that has survived the bloody storm.
Jack's serious words made Xiao Wang unable to calm down for a long time.
"Brother Jack, I will keep your teachings in mind, and I will certainly pass on this valuable experience. Xiao Wang solemnly promised. He understands the gap between appearance and connotation, and realizes that toughness does not necessarily build on hardness, and softness can also contain strength.
At this moment, Xiao Wang was reborn, and there was no longer the arrogance of the past.
Remember the lessons and draw strength from the sandbags
After Jack's vivid explanation, Xiao Wang was sublimated from his thinking. He will no longer blindly believe in the hardness of the surface, but see the essential properties of things.
It was a precious life lesson for him.
"Brother Jack, I'll keep your teachings in mind and avoid concrete walls and rely only on sandbags. Xiao Wang solemnly promised, "I will also draw the power of sand in my heart and silently guard my comrades."
"Okay, I will fully support you on the battlefield in the future. Jack patted Xiao Wang's shoulder vigorously.
Xiao Wang also looks forward to the day when he becomes a veteran, he can pass on this lesson to the newly recruited soldiers.
One day, like Jack, he will hold a hesitant recruit in the midst of a hail of bullets, describe his personal experience to him, and explain the magic of sand.
He believes that as long as this spirit is passed down from generation to generation, and sincere emotions are soaked in the yellow sand, the bullet will eventually be powerless to penetrate. We rely not only on the strength of the sand itself, but also on the deep friendship between teammates.
At this moment, Xiao Wang made up his mind - he would move forward with difficulty under the protection of the yellow sand, just to protect the lives of his comrades; He will also pass on this warm care, so that every newcomer on the battlefield can understand the true meaning of "softness and rigidity" and draw strength in his heart.