Month: January 2010

Uganda and the human rights of gays

Uganda

These last few weeks we’ve been talking about human rights, and today I heard a poignant article on NPR about the anti-homosexual bill being debated in Uganda. It touches on so many of the rights issues we’ve been discussing in class and more. Incitement by American evangelical pastors, whose invective against homosexuality is subsumed by the more tolerant US culture, can sow viscous seeds of hatred in a less liberal society. The Ugandan law being debated would increase the institutionalized discrimination to the point of including execution for gays and prison sentences for people who do not inform on them.

But the article also addresses Ugandans’ instinctive animosity against colonialism. Since homophobia has taken an important place in the Christian mythology of Uganda (in 1886 two dozen Christian palace pages were executed for not engaging in homosexual acts with the king). When foreigners (NGO’s and liberal governments) say homophobia is a violation of peoples’ human rights, the Christian Ugandan proponents of the bill claim cultural imperialism and colonialism. Note the phrase “Christian Ugandan” and consider the irony.

As an added bonus, there’s also Rick Warren, the American mega-church pastor, quoting Edmond Burke, “All that is necessary for evil to triumph is for good men to do nothing” in his late-in-coming but nice to hear condemnation of the bill. It raises the question of moral conflict, as sincere opponents of gay rights see their works taken to their scary extreme.

Adolescents often need help to realize that words have power, sometimes much more than you realize.

Though it’s not emphasized, the article also has a lesson on checks and balances in a democratic government; the Ugandan president now opposes the bill. It also teaches about international relations and the power of diplomacy. Sweden has said it will cut international aid to Uganda and the issue is overtaking other international issues. The BBC article on the topic has a great quote from President Museveni:

“The prime minister of Canada came to see me and what was he talking about? Gays,” he said.

“[UK] Prime Minister Gordon Brown came to see me and what was he talking about? Gays.

“Mrs Clinton [the US secretary of state] rang me. What was she talking about? Gays.”

Geometry and the height of the mountains on the moon

Galileo's image of the moon
Galileo's map of the moon.

Galileo Galilei matched careful observation of sunlight and shadows on the moon, with some beautiful geometry to estimate the height of lunar mountains, in 1609. He needed the Pythagoras’ Theorem and the quadratic formula, both of which middle school students should be familiar. Larry Phillips has a nice post describing how Galileo did the math. The image below (from Pioneers of Science shows how to get started.

From the Gutenberg Project eBook of Pioneers of Science by Oliver Lodge.

The Moon transits the Earth

(from NASA).

Perhaps one of the most amazing sequences of images ever taken. NASA’s Deep Impact spacecraft took these movies looking back at the Earth from 50 million km away. You can see the moon clearly crossing the face of the planet. This really resets your perspective. The full movie is below.

How to fly through space

Interplanetary spacecraft
Ion thruster spacecraft. Image from NASA.

To get anywhere in the solar system takes a long time and is not easy. The Mars rovers took years to get there and were built to be very light because heavier spacecraft are harder to lift into orbit and take more energy to get them where they’re going (and to slow the down when they get there). Getting humans to other planets, or even another solar system, is an even greater challenge. New Scientist magazine has a nice little article on different types of deep-space spacecraft that might work.

A sailing game that explores the trans-Atlantic triangular trade

Discovering America

Wind patterns over the North Atlantic Ocean had a huge effect on the colonization and history of the Americas because, after all, all they had were sailing ships. The circular, clockwise winds meant that it was easiest to sail south and west from Europe, and when you did, the first place you arrived at in the New World was the Caribbean or the northern edge of South America. This helps explains the first settlements of the Portuguese and Spanish, and why the latecomers, like the British, ended up further north up the coast of North America.

Using wind data from the University Corporation for Atmospheric Research (UCAR) and Google Maps I created an online sailing game I call Mariner AO. The game is pretty simple (basic instructions are here), you tell your ship which direction to go, starting off near Lisbon in Portugal and sail the Atlantic. What makes it interesting is that you can go wherever you like and make your own objectives. All that limits where you can go is the fact that you can only sail within 90 degrees of the wind. It’s very Montessori in that you have choice within limits.

The game is most interesting, I think, if you set objectives like trying to sail the triangular trade route, Europe (Portugal) to Africa (Dakar) to America (Charleston) and back to Europe again. The general clockwise wind pattern is persistent throughout the year, but sometimes you need to wait until the wind changes to be able to reach your objective.

Alistair Boddy-Evans has a nice article on the triangular trade of European manufactured goods to Africa, African slaves to the Americas, and plantation crops back to Europe.

I really like this game because it integrates so much. Atmospheric circulation, slavery, colonization, and even the physics of sailing if you can and want to get into it. In fact, I think it’s enough to base an entire cycle of work around. I’m still taking comments about how to improve the game.

Clouds on Mars

Clouds on Mars seen from the Mars Pathfinder

Discover Magazine blogger Phil Plait has a great post showing clouds formed by air rising over the volcanic mountains on Mars (orographic clouds). The simple animation is fascinating to see, but what’s even more interesting is how they were made. The images were taken by Emil Kraaikamp who uses a telescope in what appears to be his backyard. Each image in the series that makes up the animation is a composite from images taken with red, blue and green filters. Plait has a very good explanation of the process:

I love this, because it shows how using filters tells you a lot about what you’re seeing. Note that in the red Mars is fairly smooth, with some dark spots. The red dust covers the planet, so it smooths out features (though the ice caps are obvious). In the green you’re just starting to see a hint of clouds, and then in the blue the clouds pop right out.

Combine them, and you have Mars. Another world, seen through what most people would consider a small telescope here on Earth.

Photography is a wonderful medium for combining science and art as you manage the exposure to create interesting effects. If you understand a little about how cameras work, the page on the equipment used to take the pictures is quite fascinating.

The things you can do with vinegar and baking soda

Acetic acid and sodium bicarbonate

I like to do as much science as I can using everyday materials. When it comes to basic chemistry the vinegar and baking soda reaction is one of the easiest, safest and useful you can come across. Wayne from www.apple-cider-vinegar-benefits.com has a great page on simple experiments from basic volcano building, to stoichiometry (using a balloon) and demonstrating endothermic reactions (but you’ll need an accurate and fast thermometer).