Science

If There Is a Time Machine, Then Why Haven't Humans Come To See Us In The Future?
The reason we don't see time travelers is actually because they are not in our timeline

There Have Been Ways To Create Artificial Gravity For a Long Time, So Why Isn't Artificial Gravity Used On Space Stations?
If we make the space station in space into a ring and let it rotate, then the humans in it will also feel the "centrifugal force" to "push" themselves towards the outer wall of the space station

Planet That Collided With Earth 4.5 Billion Years Ago Found? Scientists: It Could Be Inside The Earth
Earthquakes are a common natural phenomenon. On average, millions of earthquakes occur on Earth every year, except that most of them are so mild that they are largely imperceptible to humans.

What Is The End Point Of The Evolution Of Carbon-Based Life? How Far Away Is Humanity From This Endpoint?
Theoretically, life can take many different forms, such as silicon-based life, sulphur-based life, carbon-based life, amino-life, hydrogen-based life, etc. However, so far we only know that life exists on earth, and all known life, including us humans, is carbon-based.

The Speed Of Light Is Not The Speed Limit Of The Universe, It Is As Slow As a Snail Compared To These Speeds
The universe is so unimaginably large that even if humans were able to travel at infinitely close to the speed of light, they would not be able to penetrate its mysteries. Fortunately, the speed of light is not the speed limit of the universe, so it is entirely conceivable that in the distant future, humans may somehow be able to escape the shackles of the speed of light.

It Turns Out That We Often 'Travel' Through Time, But We Don't Realise It, So How Does This Happen?
It has long been discovered in practice that the phenomenon of "gravitational time dilation" does exist

How Much Energy Is Released When 1 Kilogram Of u-235 Is Fissioned? How Long Will There Be Enough Uranium On The Planet For Human Use?
If mankind can master the method of extracting uranium from seawater in large quantities in the future, there will be enough uranium on the earth to last for tens of thousands of years, even hundreds of thousands of years!

On a More Macroscopic Level, Could The Solar System Be An Atom?
In the macroscopic world, the solar system is a system of celestial bodies centred on the sun, in which the vast majority of mass is concentrated and the major planets orbit the sun, while in the microscopic world, an atom is a microscopic system centred on the nucleus of an atom, in which the vast majority of mass is concentrated and electrons orbit the nucleus.

Nuclear Fusion Ends At Iron, So Where Do Elements Heavier Than Iron In The Universe Come From?
The energy released by nuclear fusion is actually an important basis for stars to be able to maintain their stability

What Exists In The Vast Space Between The Nucleus And The Electron? Is It An Absolute Vacuum?
In 2013, CERN discovered the existence of the Higgs boson for the first time.