Hello Word 2

A Test Post with a Header Image

6 min

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# English

A well-known scientist (some say it was Bertrand Russell) once gave a public lecture on astronomy. He described how the earth orbits around the sun and how the sun, in turn, orbits around the center of a vast collection of stars called our galaxy. At the end of the lecture, a little old lady at the back of the room got up and said: “What you have told us is rubbish. The world is really a flat plate supported on the back of a giant tortoise.” The scientist gave a superior smile before replying, “What is the tortoise standing on.” “You’re very clever, young man, very clever,” said the old lady. “But it’s turtles all the way down!”

Most people would find the picture of our universe as an infinite tower of tortoises rather ridiculous, but why do we think we know better? What do we know about the universe, and how do we know it? Where did the universe come from, and where is it going? Did the universe have a beginning, and if so, what happened before then? What is the nature of time? Will it ever come to an end? Can we go back in time? Recent breakthroughs in physics, made possible in part by fantastic new technologies, suggest answers to some of these longstanding questions. Someday these answers may seem as obvious to us as the earth orbiting the sun – or perhaps as ridiculous as a tower of tortoises. Only time (whatever that may be) will tell. [1]

# 中文

一位著名的科学家(据说是 贝特朗·罗素)曾经作过一次关于天文学方面的讲演。他描述了地球如何绕着太阳运动,以及太阳又是如何绕着我们称之为星系的巨大的恒星群的中心转动。演讲结束之时,一位坐在房间后排的矮个老妇人站起来说道:“你说得这些都是废话。这个世界实际上是驮在一只大乌龟的背上的一块平板。”这位科学家很有教养地微笑着答道:“那么这只乌龟是站在什么上面的呢?”“你很聪明,年轻人,的确很聪明,”老妇人说,“不过,这是一只驮着一只一直驮下去的乌龟塔啊!”


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# Code

# Code Blocks

Code block with the default theme "tomorrow" (click the red button on the upper-right corner to make the code block full screen):


import food

class Dragon:
  def __init__(self, happiness):
    self.happiness = happiness
  def code(self):
    """ just code """
    self.happiness -= 60
  def eat(self, n)
    # just eat
    self.happiness += n * food.size

me = Dragon(100)

while True:

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# Inline Code

const a = 1

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# Charts

# Chart.js

# Mermaid

sequenceDiagram Alice->John: Hello John, how are you? loop Every minute John-->Alice: Great! end

# roughViz.js

# Images

Image Example

# Maths

Inline math: E=mc2E = mc^2

Display math:

iψt=22m(2x2+2y2+2z2)ψ+Vψ.i\hbar\frac{\partial \psi}{\partial t} = \frac{-\hbar^2}{2m} ( \frac{\partial^2}{\partial x^2} + \frac{\partial^2}{\partial y^2} + \frac{\partial^2}{\partial z^2} ) \psi + V \psi.

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# Containers


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Show me the code.
cout << "Hello World!" << "\n";

# References

  1. Excerpted from: A Brief History of Time, written by Stephen Hawking. ↩︎

  2. 摘自《时间简史》,作者为斯蒂芬·霍金。 ↩︎