Wednesday, December 10, 2014

Thursday, December 04, 2014

Because the human "clock" is probably very close (24:11?) to 24 hours, I (and, probably, you) should not think we are "naturally" wanting to stay up later and later and would be happier on a planet with 25-hour (or longer) days. My working conjecture is that it's artificial light. "The human clock consists of a cluster of nerve cells (the suprachiasmatic nucleus) barely a hundredth of an inch in size, located deep in the brain and connected to the eyes’ optic nerves."

A well-known related theory is that blue light has the greatest effect. I'm currently (self-)experimenting with reddening my home desktop LCDs as much as possible in hardware. However, effects of this treatment on when I actually fall asleep have so far been non-obvious. I would need to more carefully collect data and experiment with undoing the reddening for a while to be sure, but if the effect is small enough that I can't perceive it directly, then the effect is not worth the hassle of avoiding blue light. Relatedly, an N=12 study found that, "as expected, only the blue light reduced nocturnal melatonin. In contrast, both blue and red lights affected cortisol levels."

On the other hand, reddened screens at night are easier on my eyes, whether they help me sleep or not.

Tuesday, September 30, 2014

Sunday, September 28, 2014

My wife alerted me to this little gem by John Calvin:
But if the Lord has been pleased to assist us by the work and ministry of the ungodly in physics, dialectics, mathematics, and other similar sciences, let us avail ourselves of it, lest, by neglecting the gifts of God spontaneously offered to us, we be justly punished for our sloth.

Thursday, September 18, 2014

The relativistic rocket. The last sentence should arguably be the first: "After only a few years of 1g acceleration even the cosmic background radiation is Doppler shifted into a lethal heat bath hot enough to melt all known materials."

Monday, August 11, 2014

On adjective order. The claim I found most interesting (as a non-expert in linguistics) was "GSSSACPM more or less applies to languages around the world." Alas, the citation was to a gated eBook chapter.

Saturday, August 09, 2014

Rosetta's Celestial navigation: The gravity assists (video) and the closing maneuvers (3D animation).

Friday, May 09, 2014

All of Bach? They promise one piece per week and they count 1074 works remaining. So, will they keep updating their website for the next twenty years? The Web itself is only 21 years old.

Wednesday, May 07, 2014

Sunday, March 30, 2014

Monday, March 17, 2014

Wednesday, February 26, 2014

Friday, January 31, 2014

Here's a 2002--2012 educational longitudinal study conducted by the US Dept. of Education of Americans who were HS sophomores in 2002. (N ~ 15,000) The results are generally unsurprising, but let me point out Table 6 (page 16), which shows, among other things, a small and negative correlation between education and job satisfaction.

My main point is that the differences were small (probably statistically insignificant), but if you're curious about the "negative" part... On average, respondents (who were all be about 25 years old in 2012) with bachelor's degrees or higher were slightly less satisfied with their jobs than high-school drop-outs; both of these groups were more satisfied than college drop-outs.

On the other hand, education is strongly correlated (see page 17) with something the study names "work support," which is a linear combination of multiple survey responses that the authors identified through principal factor analysis (page A-13). (I couldn't find any explanation for why they call this quantity "work support.")

Thursday, January 23, 2014

The smells of organic chemistry.

Wednesday, January 01, 2014

Isaac Asimov in 1964:
The appliances of 2014 will have no electric cords, of course, for they will be powered by long- lived batteries running on radioisotopes. The isotopes will not be expensive for they will be by- products of the fission-power plants which, by 2014, will be supplying well over half the power needs of humanity. But once the isotype batteries are used up they will be disposed of only through authorized agents of the manufacturer.
What might have been. Today I can read about the 30-year RTG in the Chinese moon rover:
Using plutonium-238, the battery will be able to power the 100-kilogram vehicle for more than 30 years, said Ouyang Ziyuan, chief scientist of China's lunar exploration program.

"The nuclear power system will make China the third country apart from the United States and Russia to be able to apply nuclear technology to space exploration," Ouyang said.

The moon rover is China's most advanced robot with complete automatic navigation and operations. It will be powered by the sun during daytime and by nuclear power during the night.

But where's my nuclear powered car? I'll settle for a 90Sr model...

Friday, December 27, 2013

Wednesday, December 25, 2013

The big picture.
The Lord God said to the serpent,
"Because you have done this, cursed are you above all livestock and above all beasts of the field; on your belly you shall go, and dust you shall eat all the days of your life. I will put enmity between you and the woman, and between your offspring and her offspring; he shall bruise your head, and you shall bruise his heel."
The Lord says to my Lord:
"Sit at my right hand, until I make your enemies your footstool."
The Lord says,
"It is too light a thing that you should be my servant to raise up the tribes of Jacob and to bring back the preserved of Israel; I will make you as a light for the nations, that my salvation may reach to the end of the earth."
So shall he sprinkle many nations; kings shall shut their mouths because of him; for that which has not been told them they see, and that which they have not heard they understand.
And the Word became flesh and dwelt among us, and we have seen his glory, glory as of the only Son from the Father, full of grace and truth.
The true light, which gives light to everyone, was coming into the world.
"Behold, I am coming soon, bringing my recompense with me, to repay each one for what he has done. I am the Alpha and the Omega, the first and the last, the beginning and the end."
The Spirit and the Bride say, "Come." And let the one who hears say, "Come." And let the one who is thirsty come; let the one who desires take the water of life without price.

Thursday, December 19, 2013

Wednesday, December 18, 2013

A 3D, animated map of the globe's current surface winds.

Source code.

Wednesday, December 11, 2013

Thursday, December 05, 2013

Robert O'Callahan on avoiding burnout.

Friday, November 29, 2013

A rigorous study of Tennessee’s Voluntary Pre-K Program for low-income families just found it ineffective or worse.

Tuesday, November 26, 2013

Stein's method (statistics).

Monday, November 25, 2013

Saturday, November 16, 2013

Nettlesomeness, the chess concept.

Saturday, November 02, 2013

Friday, November 01, 2013

On Genesis 1:
While more architectural imagery is highly important in understanding the creation and the notion of design is more appropriate in such a context, such imagery tends to be focused principally upon the inanimate creation... When we are dealing with the land animals in particular, what we see is a far more mediated mode of creation—‘let the earth bring forth’... In many respects, God’s creative work in this case is less akin to an external action upon passive material as an internal empowering of a process that arises within nature itself.

Tuesday, October 29, 2013

HardSciFiMovies, the Twitter account.

Thursday, October 17, 2013

Thursday, October 10, 2013

From 1932:
I read recently of an ingenious plan put forward by Russian engineers, for making the White Sea and the northern coasts of Siberia warm, by putting a dam across the Kara Sea.
I wonder whatever happened to that plan. Is it obviously wrong or infeasible in hindsight? Was the dam to go merely across the Kara Strait, or was the plan to build a ~500km dam across the Kara Sea?