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Category Archives: Science
What is a 5M NaCl solution in wt% mass fraction?
What is the equivalent mass fraction of a 5M saline solution?
A 5M molarity NaCl solution is equivalent to a salt-water solution prepared at mass fraction of 24.53 wt%. Continue reading
Posted in Science
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What happens when you let saturated salt water dry up completely?
When you leave a saturated NaCl salt solution in a glass cylinder, what happens when water dries up? Likely you thought cubic salt crystals would form at the bottom of the glass, and then grow bigger as water evaporates. You have this mental picture perhaps from reading a textbook, or maybe watching an animated video. Eventually only salt crystals are left in the cup. Well, that’s not wrong. But that is also not the full story. Continue reading
Posted in Science
Tagged evaporation, NaCl, salt creep, salt crystals, saturated saline solution
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Human Evolution by Germline Engineering is a Result of Natural Selection on Memes
(2015-10-13) I wrote this essay in 2014 as part of the Coursera course on “Human Evolution: Past and Future” by Professor John Hawks. Presumably a number of essays would be selected and published in a book. But that final selection … Continue reading
Posted in Evolution, 進化論, 論文, Science
Tagged Germline Engineering, human evolution, Memes, Natural Selection
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Debunking: The Caveman Mystique by Martha McCaughey
Debunking: The Caveman Mystique by Martha McCaughey
September 30th, 2010
by Fred Hsu
This is a diary I kept as I read yet another book an acquaintance who taught social science once recommended. The first book was dealt with in Debunking: Sex at Dawn by Rayn and Jetha. As with the first book, I rather enjoy summarizing and debunking this second book, The Caveman Mystique by Martha McCaughey.
It’s just a habit. Attempting to summarize a book allows me to organize ideas I read. If I can accurately and succinctly convey the essence of the material (emphasis on accuracy more than on brevity), I think I can be said to actually understand the material, whether I subscribe to author’s views. Continue reading
Posted in Debuking Pseudoscience, Evolution, Science
Tagged Caveman Mystique, Martha McCaughey
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Debunking: Sex at Dawn by Ryan and Jetha
Debunking: Sex at Dawn, by Rayn and Jetha
August 26, 2010
This is a diary I kept as I read a book an acquaintance who taught social science once recommend. The book presumably argued successfully against current evolutionary psychology theories and practices. I had my doubts. But as a rule I don’t criticize something I haven’t investigated. So I bought the book and read it. Following are my personal notes I jotted down after reading a chapter or two. Continue reading
Review of 50 Voices of Disbelief – Why We Are Atheists
50 Voices of Disbelief – Why We Are Atheists
Edited by Russell Blackford and Udo Schüklenk
Book Review by Fred Hsu
Sometimes mistakes have a way of helping me expand my perspective.
A long time ago, I listened to a short essay by a presumably great magician on NPR’s “This I Believe” program. Unlike other essays read on this program, this one was a belief on the non-existence of something. It was titled “This I believe: I believe there is no God.” The essay brought me to tears, as it beautifully expressed my beliefs in exactly the way I could not.
A month ago I ran across a delightful blog entry titled “Imagine No Religion.” I said to myself, “what a well-written little essay for a blog!” It nicely captured essential arguments against organized religions. Then it stripped away from religious leaders their self-bestowed authority to prescribe moral truths.
No sooner had I looked at the footer of this page than I discovered that it was one of 50 essays from the book “50 Voices of Disbelief,” reposted with permission from the author of the essay, Edgar Dahl, and the publishers. I followed the link on the page to Amazon. Normally I would have stopped there, thinking that I could always get this book later when I had free time. But I spotted the name James (The Amazing) Randi on the list of essayists. I put two and two together, and bought this book, for surely it included Randi’s great essay I’d heard on NPR.
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Posted in Atheism, 無神論, 論文, Science
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Introduction to Evolution
March 2009 Movies as the Only Source of Education for the Public: 1. In Ninja Turtles, four turtles and a rat were exposed to liquid mutagen, turning them human size with ability to speak. Impossible. 2. Hulk: physicist was exposed … Continue reading
Posted in 無神論, Evolution, 進化論, 論文
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