Posts

Climate Change Then and Now

Climate change in the past is more the rule than the exception. Earth and life have survived many changes in climate. Human civilization developed in a highly special period though - the last ten thousand years has been a period of exceptionally stable and (for humans) benign climate. Modern humans first emerged between 50,000 and 200,000 years ago, in the Pleistocene, a period of turbulent and frequently hostile climate. It's rapid and drastic climate changes may well have prevented our ancestors from developing agriculture. These climate changes have been far from benificent from the standpoint of existing species. Large scale reductions in territory and mass extinctions have been common. It's highly plausible that several of our brother species of humans met their ends in this way. The most recent ten thousand years, the Holocene, hasn't been like that. Stability and very gradual change have been the rule. Until the last 100 years. The rapid and unprecedented ...

MKS vs. Gaussian

According to the tale, a famous ship captain was noted for keeping a small chest, always carefully locked, in which he kept a small, secret notebook. Each day he would carefully scrutinize the notebook, replace in the chest, and carefully lock it. The key never left his person. Because the captain was so successful in every endeavor, many wondered about the contents of the secret notebook, but he declined all efforts to get him to share. When he died, full of honors and at a ripe old age, his first mate was quick to grab the key and open the chest. With pounding heart he opened chest and notebook. There he read: "left is port, right is starboard." MKS electromagnetic units are an abomination in the sight of the universe. That is all.

Physics Problem

Kevin Drum posts the following: Over the past couple of weeks, I've noticed that my distance vision is a little fuzzy. Time for new glasses, you say, and you're probably right. But here's the odd thing. I keep all my old glasses, and last night I tried them all on just to see if an older prescription worked better than my current glasses. What I discovered was a little strange. Right under my TV I happen to have two LED clocks. One uses red LEDs and the other uses blue LEDs. With my current glasses, the blue LEDs are sharp and the red LEDs are fuzzy. But when I put on glasses that are a few years old, it changes. The red LEDs are sharp and the blue LEDs are fuzzy. The difference is quite noticeable, not a subtle thing at all. Anyone know what this is all about? Naturally some of his commenters got the correct answer, but you should try to solve it without looking (zillions got wrong answers, of course). Hint: there are two parts to the answer, one involving physics, ...

Defensive Alliances: 1900

After its crushing defeat of France in 1870, the newly united nation of Germany became the most important European power. It's long rival France, was now smaller, weaker and less economically dynamic and was not only beaten but profoundly isolated due to the long enmity with Britain and Russia, and Bismark made it his business to keep France weak and isolated. The other power, the Austro Hungarian Empire, was ally. Kaiser Wilhelm II fired Bismark, and made Alfred Tirpitz head of his navy. Together they embarked on an ambitious ship building program designed to be able to confront Britain on the high seas. This, together with some other slights and rivalries deeply angered the British, who countered with their own ship building program. Meanwhile, the Kaiser's new Chancellor let the old treaty with Russia expire. France exploited the moment to settle its differences with both Russia and Britain, forming the so-called Entente Cordial. [British Prime Minister] Lloyd Geor...

*Redacted Redacted*

Florida's pinhead governor apparently issued a "secret" order that State officials not mention the words "cl****e ch***e" or "gl***l wa****g". This despite, or perhaps because no State is more threatened by rising sea levels. From Steve Benen's story : Everyone had a good laugh the other day when an official from Florida Gov. Rick Scott’s (R) administration tried to get through a legislative hearing on emergency preparedness without using the words “climate change.” But before the story fades from view, it’s worth pausing to appreciate the substantive question behind the humor. At issue is a FEMA requirement that states develop a “climate-change plan” in order to receive preparedness dollars. This became literally laughable in the Florida example – Scott’s chief of emergency management said the state will eventually have a hazard-mitigation plan with “language to that effect.” So why would someone purportedly elected to safeguard the interes...

Imperial Appetites

Where today the international community sees failed or failing states as a problem, in the age of imperialism the powers saw them as an opportunity. China, the Ottoman Empire, Persia, all were weak, divided, and apparently ready to be carved up. So was Morocco, which was becoming increasingly anarchic by 1900. The death of the strong and capable Sultan Hassan I in 1894 had left it in the hands of a teenager, Abdelaziz. “He is not bad looking, but podgy and puffy; good features and good clear eyes,” said Arthur Nicolson, stationed there as a British diplomat. “He didn’t look unhealthy, but like a boy who ate too much.” 50 Abdelaziz proved unable to keep control of his subjects. While his administration grew increasingly corrupt, powerful regional leaders asserted their independence, pirates attacked merchants along the coasts and bandits raided caravans in the interior and kidnapped the rich for ransom. Late in 1902 a rebellion threatened to topple the whole rickety regime. Macmillan, ...

A Whole Lot of Stupid

There is a whole lot of stupid in the world, and local density enhancements exist, but some still struggle against the tide. James J. Krupa talks about teaching evolution at the University of Kentucky. Some students take offense very easily. During one lecture, a student asked a question I’ve heard many times: “If we evolved from monkeys, why are there still monkeys?” My response was and is always the same: We didn’t evolve from monkeys. Humans and monkeys evolved from a common ancestor. One ancestral population evolved in one direction toward modern-day monkeys, while another evolved toward humans. The explanation clicked for most students, but not all, so I tried another. I asked the students to consider this: Catholics are the oldest Christian denomination, so if Protestants evolved from Catholics, why are there still Catholics? Some students laughed, some found it a clarifying example, and others were clearly offended. Two days later, a student walked down to the lectern after c...