Science

The law of conservation of energy
The spring itself is elastic, after being compressed, the spring will have the tendency to return to its initial state, and therefore has elastic potential energy, which can be seen as the energy stored in the spring as a whole system, so the question arises: if the spring is compressed into a strong acid, then after the spring dissolves, where does the energy of the spring go?
By Robert Jack4 years ago in Earth
Female mantis eats male mantis after mating: Why doesn't the male mantis run? In fact, Black Widow can't escape.
Reproduction is the instinct of all species, so in order to reproduce, species in nature have evolved countless dazzling functions, with only one purpose, to leave as many offspring as possible!
By Vicky4 years ago in Earth
Zhurong sets foot on the surface of Mars, and the inspection tour begins! Don't think it's small, it's actually huge
One week after the Tianwen-1 lander landed on Mars (May 15), good news came on May 22. The National Space Administration announced that the Zhurong Mars rover had left the lander platform and set foot on the surface of Mars.
By Vicky4 years ago in Earth
Electrocatalysts with bifunctional covalent organic frameworks with tunable p-band centers for rechargeable Zn-air batteries
Fine control of the physicochemical structure of carbon electrocatalysts is crucial for improving the slow oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in rechargeable zinc-air batteries. Covalent organic frameworks (COFs) are considered good candidates for carbon materials because their structures can be precisely controlled. However, conferring bifunctional electrocatalytic activity on COFs to ORFs and OERs remains a challenge. Herein, pyridine-linked triazine covalent organic frameworks (PTCOFs) with well-defined active sites and pores were easily prepared under mild conditions, and their electronic structures were tuned by incorporating Co nanoparticles (CoNP-PTCOFs), resulting in Induction of bifunctional electrocatalytically active ORR and OER. CoNP-PTCOF showed low overpotential for both ORR and OER with excellent stability. Computational simulations found that the charge transfer shifts the p-band center of CoNP-PTCOF down compared to pristine PTCOF, which facilitates the adsorption and desorption of oxygen intermediates on the pyridine carbon active sites during the reaction. Compared with batteries containing commercially available Pt/C and RuO2, the Zn-air battery assembled with bifunctional CoNP-PTCOF has a small voltage gap of 0. V and excellent durability of 720 cycles. This strategy of tuning COF electrocatalytic activity can be extended to design various carbon electrocatalysts.
By Vicky4 years ago in Earth
Mysterious material in the Mariana Trench that shouldn't exist, scientists express concern
In the Pacific Ocean, there is one of the deepest trenches on earth. Since humans began to study it in the early 1960s, it is still very mysterious to this day. It is 10,984 meters away from the sea, which also makes it very mysterious. It has become a challenger abyss of "no one is allowed to enter", and few people have ever been there.
By Vicky4 years ago in Earth
10,000 years ago, human ancestors made a mistake, causing mosquito genetic mutation to bite like crazy
In China, whenever summer is approaching, the residents of the south have to face a problem, that is, mosquitoes. Mosquitoes are almost everywhere, and as long as there is a sanitary dead corner in the home, there can be a breeding ground for mosquitoes. Mosquitoes are annoying when they fly to people's ears and buzz, but what they fear most is the harmful bacteria and viruses they carry. It is precisely because of its ability to transmit many deadly diseases that mosquitoes are listed as "one of the four public enemies of mankind".
By Vicky4 years ago in Earth
After 100 years of disappearance, the "Wolverine" in the United States has reappeared. Why can extinct creatures be resurrected?
In the 19th century, after years of research, a great biologist proposed the survival law of all animals and plants in nature, that is, natural selection. We can also understand natural selection as "natural selection, survival of the fittest", and only species that adapt to environmental changes can stay in their original habitats. If a species cannot adapt to changes in the environment, they end up with only two outcomes, either extinction or migrating to other more suitable habitats.
By Vicky4 years ago in Earth
Will humanity perish if only children under a year old are left?
Friends who say that there are only children under 1 year old and that human civilization will not go extinct have no idea how "stupid" human babies are.
By Vicky4 years ago in Earth
After the astronauts died in the universe, the remains fell into other planets. Could it be the origin of life?
The courage to explore the unknown is an excellent quality engraved in human DNA, and exploration must be accompanied by sacrifice. It can be said that all the achievements of human exploration are intertwined with the sad song of blood and tears
By Vicky4 years ago in Earth
Oxygen on Earth has surged twice before, what would happen if it happened again?
Oxygen is not an "innate" substance to the earth. In the past 4.55 billion years, the oxygen on the earth has undergone a process of "from nothing, from less to more", and in this process, Oxygen does not increase linearly, in fact, oxygen on Earth has exploded twice.
By Vicky4 years ago in Earth
When the temperature reaches 5°C, it will die. Rare species appear in Antarctica and must stay at low temperature all their lives.
The earth is a huge ecosystem, in which there are tens of thousands of species, they all survived after the "baptism" of the earth, so every species is the darling of the earth. It is difficult for us to guarantee that all species in the world have been discovered by us. After all, the world is too big, and there are still many hidden corners, where there may be creatures that we have not discovered before.
By Vicky4 years ago in Earth
It was found that a tree stump was alive, contrary to common sense, and then scientists made new discoveries in the soil
Life is the most precious thing in the world. There is nothing that can measure it. Living things are endless. They multiply and live in the biosphere of the earth. While bringing vitality to the earth, it also makes the whole earth full of vitality, and promotes carbon and water cycles. Provide a chance to survive.
By Vicky4 years ago in Earth