Stephen Hawking is the best interpretation of Hamlet's words.

Hawking was born in Oxford, England on January 8, 1942. He is one of the greatest astrophysicists in modern times. The main areas of research are cosmology and black holes. Hawking died on March 14, 2018, and was buried in Westminster Abbey, London, between Newton and Darwin. Like the great human pioneers Copernicus, Galileo, Kepler, Newton and Einstein, he shines eternally in the starry sky of wisdom.

But such a giant in science is actually a disabled person who is completely paralyzed and unable to speak in life. He contracted amyotrophic lateral sclerosis, commonly known as ALS, when he was 21 years old. As time went by, his condition gradually worsened, and the loss of muscle function resulted in only three fingers in his body being able to move.

The illness and wheelchair limited his body, but they could not limit his thinking.

Hawking lived an extraordinary life on this planet, but used his whims and the laws of physics to travel across the universe. He has been to the farthest reaches of the Milky Way, traveled into black holes, and returned to the beginning of time.

The wheelchair is too small, but fortunately the universe is big enough.

The body is too small, but fortunately the mind is big enough.

"Ten Questions: Meditations of Hawking" is Hawking's last posthumous work.

The book records Hawking's thoughts on ten issues.

Does God exist? How did it all begin? Is there other intelligent life in the universe? Can we predict the future? What's in a black hole? Is time travel possible? Can we survive on earth? Should we colonize space? Will artificial intelligence surpass us? How do we shape the future?

About the origin of the universe, about time travel, about the future of mankind... In a body that is not strong or even weak, it is thinking about such huge problems.

Perhaps, only in the face of the vast universe, personal suffering will seem less sad. As Hawking himself said:

"So remember to look up at the stars, not at your feet. Try to understand what you see and pursue the reasons why the universe exists. Stay curious. No matter how hard life gets , there is always something you can do and succeed. The important thing is that you don’t give up. Release your imagination and shape the future.”

It is always easy to be blinded by what is in front of you. Be careful. Whether it is immediate suffering or prosperity. So when you are overly depressed or blindly arrogant, please raise your head and look at the sky.

When you look up at the incomparably vast sky, life inhabiting the universe is so insignificant and accidental. Even the development history of all mankind is insignificant in the long river of time and space in the entire universe, let alone It's a single person's life.

Sickness, poverty, desire, greed, and vanity are like shackles that have locked up too many people.

But don’t forget to dance while wearing shackles.

Even if you are in a nut shell, your heart should be open to the universe.

May we love science and always maintain a curious and exploring heart.

Don’t focus all your limited energy on a certain man or woman, but try to focus on all mankind, this planet, this galaxy, this universe.

Finally, share a limerick about time travel in the book