Monday, 10 June 2024

Critical Thinking Exercises

 

Some critical thinking exercises are available on the following:

Philosophy Department, University of Hong Kong

Critical Thinking Web

Module: Critical Thinking

    • [C06] The Cognitive Reflective Test

Module: Meaning Analysis

    • [M03] Evaluating definitions
    • [M04] Examples
    • [M06] Necessity and sufficiency
    • [M08] Obscurity

Module: Argument Analysis

    • [A01] What is an argument?
    • [A02] The standard format
    • [A03] Validity
    • [A04] Soundness
    • [A05] Valid patterns
    • [A06] Validity and relevance
    • [A07] Hidden Assumptions
    • [A09] Good Arguments
    • [A10] Argument mapping
    • [A11] Analogical Arguments

Khan Academy - LSAT logical reasoning

You can find examples of logical reasoning in the Khan Academy videos on YouTube:

If you have a Khan Academy account, there is more information on logical reasoning in the LSAT course.  Khan Academy accounts are free.

More on the Schrodinger's Cat

 
World's Heaviest Schrödinger's Cat: Quantum Crystal Visible To The Naked Eye
from New SciTech 新科技

World Heaviest Schrodinger's Cat: Quantum Crystal

Michael mentioned about this experiment in last Wednesday's class (5/6/24).  The YouTube video above and the article in Scientific America below give brief explanations of the experiment involving putting a sapphire crystal into superposition.

Scientific America - Physicists Create Biggest-Ever Schrödinger’s Cat

Extend the time of the experiment?

Ken asked an interesting question in class last Wednesday (5/6/24).  "What if we extend the time for the cat to be in the box to one month?" Ken asked.

The following answers are my speculation of how physicists might respond:

1.  Schrodinger designed the thought experiment so that in the course of an hour one of the atoms will perhaps decay, but also, with equal probability, that none of them will.  Thus in the course of an hour, the cat will with equal probability either be dead or be alive.  There is genuine uncertainty in the minds of the researchers about whether the cat is alive or dead.  If the time were to be extended to one month, this would void the experiment. 

2. We need to assume that the cat can happily stay in the box for one month, since starving the cat to death in the box is not the point of this thought experiment.  Then whether the cat is dead or alive still depends entirely on the possible decay of the tiny amount of radioactive material in the box  (refer Wikipedia page on Schrodinger's Cat for details of the thought experiment.).  It is possible then that the cat could still be alive after one month in the box if for some reasons the tiny amount of radioactive material did not decay as expected, or the equipment did not work as expected.  Therefore, even if the time is extended to one month, one can still argue that the cat is both dead and alive in the box until the box is opened by the researchers.

3. The thought experiment, as intended by Schrodinger, was to last for only one hour. If the experiment were to be extended to one month, the probability of the cat being dead can be represented by a graph that approaches one after certain time.  Physicists might interpret the meaning of this probability graph as follows:

    • The cat, being a relatively large physical object, cannot be in superposition of being both dead and alive; or
    • the cat is actually in superposition of being both dead and alive and remains so until the box is opened (as discussed in (2) above); or
    • the cat is actually in superposition during the initial stage of the experiment when there is genuine uncertainty, but the superposition disappears when it becomes certain that the cat is dead. 

Monday, 3 June 2024

Smell the glove is here

 

This topic was proposed by Maggie for our End of the Financial Year discussion.  Please see the article below:

"Smell the glove is here" by Bob Horning

Some supplementary information:

  • Bob Horning is a writer, mostly about technology; former New Inquiry, Real Life editor.
  • "Smell the glove" is a fictional album of the band Spinal Tap in "This Is Spinal Tap", a 1984 American mockumentary film.
  • The picture in the article is of Tony Hendra, (10 July 1941 – 4 March 2021) who was an English satirist and writer who worked mostly in the United States. He starred in the film This Is Spinal Tap as the band's manager Ian Faith.
  • The YouTube video below "Smell the Glove by Spinal Tap" gives background information about the title of the article by Bob Horning above. 
  • The article above mentions the following people:
    • Matt Levine (born 1978) is a columnist for Bloomberg News covering finance and business.
    • Jim Simons (April 25, 1938 – May 10, 2024) was an American hedge fund manager, mathematician, and philanthropist.  At the time of his death, Simons' net worth was estimated to be $31.4 billion, making him the 51st-richest person in the world.
  • The video below has been compiled by Maggie.  This video provides additional information on the topic.

  Some questions for discussion:

  • Is the fact that Jim Simons became rich a proof that this mathematical method is superior to the analytical? 
  • The market is irrational as it is. This approach smells like religion and grand scale manipulation.  If many people use his method, wouldn’t this distort the market, like with the GameStop
  • If one adds AI, which can find the patterns, but also makes the decisions for humans, what's the point of humans?
  • Does the use of data as described in the article spell the end of epistemology, rational thinking, critical thinking, and science?
Smell the Glove by Spinal Tap by SpinalTapFan01

Wednesday, 22 May 2024

Schrödinger's Cat and the Double Slit Experiment

 

Quantum 101 Episode 4: Superposition Explained | Schrödinger's Cat
Perimeter Institute for Theoretical Physics

On 22/5/24, the thought experiment of the Schrödinger's Cat was discussed in class.  

Three interesting questions relating to the Schrödinger's Cat are:
  • What was the original intention of the story?
  • Why does Schrödinger's seemingly paradoxical thought experiment become part of the foundation of quantum mechanics?
  • How would one respond philosophically to the findings of quantum theory?
    • A response to the above is here
The story is related to the double slit experiment as explained below.


Double Slit Experiment explained! by Jim Al-Khalili
The Royal Institution

Additional Information

1.   YouTube video: A Brief History of Quantum Mechanics - with Sean Carroll - The Royal Institution: https://youtu.be/5hVmeOCJjOU?si=GviGWw4WK6NOtZ_O (The Schrodinger's Cat thought experiment is explained at around 17:25 minutes in this video)

2.  Wikipedia - Schrödinger's Cat: https://simple.wikipedia.org/wiki/Schr%C3%B6dinger%27s_cat


Wednesday, 15 May 2024

Some questions related to Critical Thinking


We had an interesting discussion in class today (15/5/24).  A number of questions were raised in class today which could be explored more.  All these could be a discussion topic on their own.  Thanks to all the class members who brought these topics up in class.

What is Post Hoc Ergo Propter Hoc?

This informal fallacy was mentioned in class.  The following gives some information on the fallacy.

Wikipedia: https://en.wikipedia.org/wiki/Post_hoc_ergo_propter_hoc

YouTube- Wireless Philosophy: https://www.youtube.com/watch?v=5A7hSaoRv0g

Are there Facts?

The term "Fact" was discussed in class today.  The following gives some information on the term.

Wikipedia: https://en.wikipedia.org/wiki/Fact

Stanford Encyclopedia of Philosophy: https://plato.stanford.edu/entries/facts/index.html

PPPD post - Fact and Truth: https://philosophyphorphun.blogspot.com/search?q=Facts

Do luck and serendipity relate to critical thinking? 

For scientific studies, which use inductive reasoning, scientists use appropriate techniques such as experimental design, random sampling to avoid the effect of luck and serendipity in the their experimental results and conclusions.  Nevertheless luck and serendipity can play a significant role in scientific research and discovery.

The following links give some information on luck and serendipity:

Internet Encyclopedia of Philosophy: https://iep.utm.edu/luck/#H1

The Philosophy of Everything: https://www.thephilosophyofeverything.com/blog/2016/8/28/the-philosophy-of-luck 

Wikipedia: https://en.wikipedia.org/wiki/Serendipity

[The following response to this question was added on 19/5/24]

ABC Radio Late Night Live - How chance and luck profoundly shape our lives:  

https://www.abc.net.au/listen/programs/latenightlive/annie-jacobsen-nuclear-war-mark-rank-luck-randomness/103744286

Do you believe in ghosts?

One might decide to believe in ghosts or not.  Would one accept a particular religious or cultural account of ghosts, or would one work out an individual version of the concept of ghosts?   If one decides to believe the existence of ghosts, how does that affect one's outlook and daily life? 

A Philosopher's Blog:  https://aphilosopher.wordpress.com/?s=ghost

Wikipedia: https://en.wikipedia.org/wiki/Ghost

[The following response to this question was added on 19/5/24]

[Sam's contribution 19/5/24]

As mentioned above, one might decide to believe in ghosts or not.  

One common way of deciding if something is real or not is to rely on one's perception.  If one can see and feel a table in front of oneself, one is entitled to believe there is in fact a table in front.  Another way to decide if something is real or not is to rely on a trusted source.

Therefore, if one has seen ghosts or if a trusted friend says they have seen ghosts, how should one respond to that information?  

After carefully considering the information, one may consider what happened or what was reported to have happened was hallucination or illusion.  The following gives some information on the topic of hallucination:

Cleveland Clinic article on Hallucinations:   

Wikipedia - Hallucination: https://en.wikipedia.org/wiki/Hallucination

The following gives some information on mass hallucination:

The Bart Ehrman Blog: https://ehrmanblog.org/group-hallucinations-how-can-they-possibly-happen/

American Psychological Association: Collective hysteria - Updated on 04/19/2018

The spontaneous outbreak of atypical thoughts, feelings, or actions in a group or social aggregate. Manifestations may include psychogenic illness, collective hallucinations, and bizarre actions. Instances of epidemic manias and panics, such as choreomania in the Middle Ages, tulipmania in 17th-century Holland, and radio listeners’ reactions to the Orson Welles broadcast based on H. G. Wells’s War of the Worlds in 1938, have been attributed to collective hysteria. Also called group hysteria; epidemic hysteria; mass hysteria. 

However, if one considers that the scientific explanations are not satisfactory, and decides to believe in the existence of ghosts, what then?  Should one accept a particular religious or cultural view of ghosts?  

Personally, I believe if one decides to believe in ghosts, it is better to come up with one's personal concept of ghosts.  This is because (1) there are many different religious or cultural views of ghosts.  It would be difficult to work out which is the correct view; and (2) religions and cultures often have particular reasons why they form their views of ghosts which may not be suitable or appropriate for oneself.

My initial thought is that ghosts, if real, could be like the person's mental spirit.  The physical body would pass away, but the person's mental spirit lingers.  That mental spirit would also eventually pass away just like the physical body.  My rationale is that often reports of ghosts are seen in this world.  Therefore, based on the principle of Occam's razor, there is no reason to postulate there is another realm where ghosts live.  In addition, often people do not report that you see ghosts of people who have passed away many years ago.  Therefore, it is reasonable to postulate that ghosts do not exist forever.  

Can we rely on perception to determine truth?

[This question and response were added on 21/5/24]

Perception can be a tricky foundation for determining truth, as it is inherently subjective and influenced by numerous factors such as personal experiences, beliefs, and biases. While perception can provide us with valuable information about the world around us, it is not always a reliable indicator of objective truth.

For example, optical illusions demonstrate how our sensory perception can be deceived, leading us to interpret visual information in ways that do not align with reality. Similarly, two people can witness the same event but have different perceptions of what occurred based on their individual perspectives.

In philosophy, this topic is often explored under the branch of epistemology, which studies the nature of knowledge, belief, and truth. Philosophers have long debated whether our senses can be trusted to convey truth, with some arguing that only through reason and logic can we approach an understanding of objective reality.

Ultimately, while perception is a valuable tool for navigating our environment, it is important to corroborate perceptual experiences with evidence and rational analysis to form a more accurate picture of truth.

[The above response is from Bing Copilot 21/5/24]

The following videos may be relevant to this question:

Your brain hallucinates your conscious reality | Anil Seth | TED: https://youtu.be/lyu7v7nWzfo?si=aKAwkHwjIREkiomt

Consciousness: Neuroscience, Perception and Hallucination – Professor Anil Seth:  https://youtu.be/cCyapf0E5ns?si=jqNtB8mUIFP-5vR6

The above videos may be relevant to the question regarding Ghosts.

What is the history of Critical Thinking?

[This question and response were added on 21/5/24]

The following article gives a description of the history of Critical Thinking:

A Brief History of the Idea of Critical Thinking

Monday, 13 May 2024

The Song of the Travelling Son

Photo by KE ATLAS on Unsplash

The following poem is a well known Chinese poem called The Song of the Travelling Son 遊子吟 from a Tang dynasty poet Meng Jiao 孟郊 (751-814).  

慈母手中線,遊子身上衣。 

Sewing-thread in hand, the loving mother;
Clothes for the son to wear, her travelling son. 

臨行密密縫,意恐遲遲歸。 

On and on she sews, his leaving now nears;
Stitch on stitch, she fears -- a delayed reunion. 

誰言寸草心,報得三春暉。 

Who says the heart of a mere grass seedling, can ever
Repay the embracing rays of the warm spring sun!

This poem is about an ordinary mother of meagre means.  The mother has to make the clothes for the travelling son herself.  The third and fourth lines describe how she busily does her sewing as her son is about to leave.  She worries if her son will be late coming home.  

This mother is not doing anything extraordinary.  That is exactly how the poet describes the mothers' love everywhere and through all times.   There are some mothers who might be doing amazing things, and there are some who are not loving.  The poet indirectly acknowledges that there are exceptions.  

The poet is describing an ordinary mother who is concerned her son may not be warm enough when travelling.  She worries when he will be coming back, yet there is no indication that she would complain about her son's leaving.

The last two lines compare the heart of a young person to that of a mere simple grass seedling, and the mother's love to the embracing rays of the warm spring sun.  The poets compares the relationship between mother and son to that of the sun and a blade of grass.  The mother's love for her son is like the sunray on the grass.  

Thursday, 25 April 2024

Myth we need to survive - Yuval Noah Harari


"Yuval Noah Harari on the myths we need to survive"
by Intelligence Squared

The above video was suggested by one of our class members for class discussion.  The moments of the video above and the questions for class discussion are listed below:
  • 02:10 - What are the 3 important moments in the history of humans?
  • 05:50 - Humans were and still are very destructive.  What gave them that power? 
  • 10:55 - Why do humans believe in myths?
  • 15:30 - Can myths unite us?
  • 18:00 - Why are myths important?
  • 21:00 - How are myths created?
  • 23:55 - Why do we have a gender imbalance?
  • 30:40 - How are money, economic growth and consumerism myths?
  • 36:40 - What will the religions of the future be like?
  • 39:30 - Can science and myths co-exist?
  • 42:45 / 44:40 
    • What can women do to address gender imbalance? 
    • Should religions leaders who spread myths that caused terrible genocides be charged?
    • How can humans respond to climate change?
  • 51:35 / 53:40
    • Are successful stories related to objective truth? 
    • What should we believe? 
    • What caused the cognitive revolution? 
  • 1:00:25 / 1:02:00
    • Can humans believe in a common myth so that we will be more united? 
    • Are there stories that run from the very beginning and have an immutable core? 
    • What will be the next big story?
  • 1:09:40 / 1:11:20 
    • What is the future of nationalism? 
    • Is love a myth? 
    • Why do humans have this dissonance between the stories they tell their children and the way  they treat animals?
  • 1:20:00 - 
    • Can today's world function without money? 
    • What advice can we give a child of 6 years old preparing for the future of AI and robotics? 
    • Voltaire is translated to have said: "Those who can make you believe absurdities can make you commit atrocities." How do we inoculate future generations against such myth-stakes? 

Other Questions

After watching the video, perhaps you could reflect on the following and other questions you might have:
  • Is Cognition Revolution the same as Cognitive Leap? 
  • Is Cognitive Revolution used to describe another event?  
  • Was Professor Harari's description of human evolution and migration consistent with other sources?
  • Are some of the myths Professor Harari nominated, such as money and nation the same as myths we commonly associate with such as those in Greek mythology?
  • How are they different?  Are there other descriptions that we could use to describe nouns like money, nation, love, hope, faith, mammals, plants, Christmas etc.?
  • Is the test of suffering, as described by Professor Harari, a reasonable test for determining if something is real? 
  • As pointed out in the video by Professor Harari, humans are very flexible in their beliefs with respect to contradictions. One may call that double standard or hypocrisy in some situations. The example given by Professor Harari was how Christians believe in an almighty God that is omnibenevolent yet allows evil to exist.  Can you think of other examples?  Do you think that is human nature? Why is that so? 
  • One question for Professor Harari was "What advice can we give a child of 6 years old preparing for the future of AI and robotics?" However, humans face many more challenges in addition to AI and robotics, including nuclear war, climate change, and bio-security disasters.  What advice would you give a 6 year old child and their parents on how to prepare for this future?

The Philosophy of Politics and Power

  1. Introduction: What is Political Philosophy? by YaleCourses Political Philosophy The above YouTube video provides an introduction to pol...