Tertiary Source

Ice tray stalagmite

2010-02-21 20:19:22
Look! I had a stalagmite in my ice cube tray.
an ice cube tray
what is that?
it sticks out against a card

Eleventy-one thousand eleventy-one

2009-08-14 09:08:00
Here's a million-to-one photo I took yesterday:
odo: 111111, 44 mph

Remember the significance of the three circles!

2009-07-10 14:57:28
When I was a freshman I took Philosophy 110. It was a big lecture, and the professor had a habit of rambling (which I mostly found entertaining); there was the customary falloff in attendance as the term went on. During one lecture the professor was working up to making three points and put some bullets on the whiteboard:
He then promptly distracted himself with a tangent about how boring people drive Fords, and whenever you see a Ford it's being driven by a boring person. After a couple minutes of this he turned back to the board and said, "I have no idea why I made these three circles. They must mean that boring people drive Fords." This got a chuckle out of the class, and he added, "Remember that! It'll be on the final."

Vaccine fears and risk tradeoffs

2008-12-26 11:28:25
This weekend's This American Life included interviews with some of the participants in this summer's measles outbreak. I learned about the outbreak from a somewhat overblown reaction from Phil Plait. From memories of Plait's older material, I expected a little lesson in conditional probability. Not finding one, I did an analysis of my own. I reached the surprising-to-me conclusion that, even with this summer's outbreak, the risk tradeoff between measles exposure and vaccine side effects is not totally unbalanced. My writeup at the time got lost in comment noise, so I'll condense it again here.

A duck from the Economist

2008-12-08 10:32:10

Here's a nice duck from the Economist. It's interesting that coups d'etat have become less common in recent years. It's also interesting that these commandos are reaching through the grid lines to pat the data.

Coups and attempted coups worldwide

Rail fuel economy

2008-12-05 01:04:24

Dylan Foley pointed out to me that my question about CSX's advertised fuel efficiency has previously gotten attention from FactCheck.org.

Musical Doppler self-sonar

2008-11-14 18:42:18

If you stand reasonably close to a road, the sounds of passing traffic get Doppler shifted: they start off high and end up low, "wheeeee-oooooom." Professional and amateur musicians have sophisticated training in recognizing frequency ratios. (Though, explicitly mentioning the relationship between frequency/wavelength ratios and intervals is more common when players of string instruments experiment with making harmonics.) How accurately could you estimate the speed of a passing vehicle by the sound it makes?

What's the antimatter content of a banana?

2008-10-21 11:06:37

Antimatter is strange, exotic stuff, right? Only produced in dangerous physics experiments? Leads to complete annihilation with ordinary matter?

Sort of. It's a question of quantity.

Recent questions


Older questions

How many Homo halibus ever lived? What fraction have been dug up and examined? What about other species? How does the fraction of individuals preserved and studied fall off as you moved back through time?
2009-05-29 Friday 07:11:19
In a letter to Physics Today Roger Musson writes that the terms "Stone Age," "Iron Age," etc. refer to the material used most commonly to construct knives. This means we are currently in the Stainless Steel Age, possibly changing to the Plastic Age. By some reasonable measure, when would the transition happen?
2009-05-28 Thursday 17:37:37
Sensitivity to market fluctuations: a disadvantage to overly progressive taxes?
2009-02-25 Wednesday 20:31:21
How does the Stephan-Boltzmann constant σ "run" at temperatures where radiation modes other than photons become accessible?
2009-01-31 Saturday 13:34:02
Much of the work of digestion is done by bacteria in the gut. Could an appropriately engineered infection permit someone to extract nutrition from normally indigestible materials, like grass and wood?
2009-01-29 Thursday 19:37:59
If you pull two connected blobs of Silly Putty apart slowly, the thread between then stretches plastically; if you pull them apart quickly, it fractures cleanly. What sets the threshold? How sharp is it?
2008-10-20 Monday 16:16:27
What's a typical pattern of presidential pardons? How has this changed under recent administrations?
2008-10-13 Monday 17:46:13
An observation by Consumer Reports, that breakfast cereals marketed to children aren't terribly nutritious, has gotten some evening-news press. The main contribution of the Consumer Reports release seems to be that they bought a bunch of cereal and read the nutrition labels. What's new here? Has the composition of existing products been tweaked? Have some sweeter brands been introduced to replace healthier ones? How do these sorts of news blobs correlate with sales, or with marketing spending?
2008-10-06 Monday 12:29:26
The Economist claimed that an oil price spike on September 22 (or thereabouts) was a quirk of timing, due to some minor supply quirk that happened to happen in the last couple days to fill contracts for delivery October 1. When I hear about "the oil price" on the news, what am I hearing? Is there information in the spread between short- and long-term prices that isn't reflected in either market alone?
2008-10-03 Friday 00:57:19
If you feed a Markov chain its own output, does its behavior get more stable or less stable?
2008-09-29 Monday 17:33:56