The space in the Tree of Babel is surprisingly large.

The tree is so big that there are many holes, not only at the bottom, but also in the trunks that go upwards one after another. After all, this giant tree king is more than 100 meters thick, and it is normal for some places to be hollow.

And it seems that it can be built layer by layer according to the texture of the tree, and many predecessors have built it, so it is like a sky-high building. Not to mention hundreds or nearly a thousand people living in it, even if you drive a modern locomotive from the entrance of the largest tree hole, you can enter.

"It's a miracle that this tree has been dug so empty, and it won't fall down......" Captain Lao Niu, who was following He Zilong, said in surprise.

"The survival and growth of the tree basically depends on the bark part, even if the tree is hollowed out, it's fine, don't you see that the middle part of many big trees is empty......" The captain explained to the old cow.

He Zilong also listened in front, but didn't say anything.

Plant bark, in addition to protecting plants from cold and heat, and preventing pests and diseases, is mainly used to transport nutrients. In the skin of the plant, there is a layer of tissue called the phloem, which is lined with pipes, and the nutrients produced by the leaves through photosynthesis are transported to the roots and other organs of the plant.

If the phloem of the plant is damaged, the bark is stripped off in a large area, and the new phloem does not have time to grow, and the roots of the tree die due to the lack of organic nutrients. As the saying goes: "People are afraid of sadness, trees are afraid of peeling", and the truth is here.

However, this tree of heaven, well, He Zilong touched the bark of this tree with his hand. It didn't feel right, and he even took out a knife and slashed a few times, leading the people on the side to look at it a few more times.

"The Babel Tree is very hard, we can hardly destroy it, so this tree hole is actually natural, and the internal space and collocation are just installed on the original appearance, but they can't change the inside and ......outside of the tree at all," Lan explained to He Zilong with a smile.

Hearing this answer, not only He Zilong, but also the other people who came over were also very curious, and they took out their weapons and tried them.

As a result, whether it is a slash, a sword stab, or an axe, no matter how much you try, you can't leave the imprint of damage on the tree of Babel. It's many times harder than the trees outside the hardest surface!

He Zilong even wondered if the density of this tree would be stronger than the hardest metal on the earth's surface. Like, chrome!

Chromium, chemical symbol Cr, is a steel-gray metal. The name of the element comes from the Greek word for "color", because chromium compounds have color. The oxidation number is 6,5,4,3,2,1,−1,−2,−4, and it is the hardest metal.

However, in later generations, the synthetic carbyne sulfide was considered the hardest, but now it has not appeared in the nineties.

Caryne sulfide has twice the tensile strength and three times the tensile stiffness of diamond as its graphene precursor. It is stable at room temperature and can form predictable crosslinks with other strands when stored together. Although its structure is simple, it is 200 times stronger than steel.

It seems that the guards understood the newcomer's lament at the toughness of the Babel Tree. Not surprising!

However, it is also understandable that such a tall, almost sky-high tree, if the hardness is not high, and it is also hollow. That would almost certainly have fallen a long time ago, like a skyscraper, the foundation is not well laid, not strong enough, how can it be built so high. In the same way, it is also here in the Babel Tree, otherwise it would not have been possible to grow so tall!

"The tree has very few branches, and the leaves are very small, basically the main branches, and only in the upper part of the tree can you see a little more branches, and the ,...... of leaves," someone questioned.

Generally speaking, the larger the tree, the more branches it should have and the more foliage it should have. But it's not the same here!

"The underground world is different from the outside, the light taken is not sunlight, the tree is big enough, it is already full of light, and then there are many branches, and there are many leaves, but it wastes nutrients. Originally, I was thinking that this tree was so hard, and if you picked up a few twigs, you could use it as the hardest weapon. No, it doesn't seem realistic now. The branches on it are huge, and there are few branches, and the leaves are too, adults can't take them, it's good to be used as a shield, it's not good, it's too hard and it also means it's too heavy, this can be so dense, I'm afraid that the same volume, it's N times heavier than gold, and ordinary people can't pick it up......" He Zilong muttered to himself, but he didn't say his thoughts.

It wasn't until I saw the guards here, none of them using the branches of the Heavenly Tree or the fallen leaves as weapons, and suddenly thought of something.

was walking behind Nalan's third uncle when a loud noise suddenly came from outside, as if something huge had fallen down.

"It seems that it should be a rare time, a leaf fell from the top of the Babel Tree, smashed a big hole, and the soldiers did not raise the alarm......" Lan seemed to be familiar with this kind of thing, shrugged his shoulders and reassured He Zilong and the others.

He Zilong's brows twitched, and it seemed that this time he had confirmed his conjecture.

Take gold as an example, how much does a cubic meter of gold weigh?

The density of gold varies slightly with temperature, ranging from 19.29 to 19.37 g/cm³ at room temperature. At 20 degrees Celsius, gold has a density of 19.32 grams per cubic centimeter!

1 cubic meter of gold is 19.32 * 10^6 grams = 19,320 kilograms = 19.32 tons = = = 38,640 catties, yes, about 40,000 catties. That's about two tons!

One of them just ran to see the leaves falling down, such a big movement, like a truck falling from the sky and shaking the ground, and when he ran back, he was secretly surprised. As soon as he said this to the people in the team, he said that only a leaf about a meter in size fell, and smashed a large crater several meters deep into the ground.

Fortunately, this leaf usually falls very little, in case countless leaves fall every day. Just a person moving underneath and smashing it lightly will basically kill him, and everyone will be afraid for a while when they hear it.

Now I can understand why none of the natives here use the leaves of the Heavenly Tree as a shield, the density is N times greater than gold, and the human strength cannot hold it at all. And if some monsters and animals can pick it up, people are originally pure flesh collisions, and they don't need this kind of leaf as a shield. Animals don't have hands to hold such leaves!

"Such a tree, that is really not afraid of someone cutting down, but afraid that modern tree cutting tools will come, and it is useless. Even if it is used for fixed-point blasting, I don't know if it can have much effect, and I don't know how deep the roots of this tree are deep into the ground......" Everyone glanced at each other, and the thoughts in their hearts were basically the same.

"My father is seriously ill, and now the affairs of the clan are basically governed by the elders, as well as a few uncles and fathers, and of course, my brothers, you live here first. It's that area, the area outside the tree......" After Lan came down from above, his face was a little unnatural, and he invited He Zilong and the others to come back, but asked them to go to the area outside the tree hole to live.

It seems that Lan's status is not very high in the clan, even if her father is the patriarch.

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