Month: May 2016

Web design: CSS margin and padding

The tutor shows examples of margin and padding, two important aspects of a webpage element’s style. An element’s margin is the space around it. It can also be seen as the space between the element and other elements. This paragraph

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Lifestyle: plant identification from field guide: Norway maple

The tutor shares another neighborhood find. I’ve noticed, over the years, maple trees that have dark red, or purple, leaves. For some reason, I imagined I knew what kind they were, but had just forgotten. Today I noticed another one,

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jQuery: toggle()

The tutor begins with jQuery, talking specifically about its show(), hide(), and toggle(). jQuery is a library of functions used for web design. Some of its best known are visual effects such as show(), hide(), and toggle(). Its toggle() flip-flops

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Business and Economics: The price of oil, Part II

The tutor looks into why oil is less than half its price two years ago. Back when oil was over $100, I thought I understood the reason: China, India, and other developing countries have a growing middle class. Those swelling

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Business and Economics: ripples from the price of oil

With some reflections, the tutor opens a discussion about the price of oil. For years, I tutored high school math to young men headed to Alberta or Saskatchewan. Months later, in the oil fields, they made several times what I

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Calculator usage: how to get rid of “P” or “PEN” on some Sharps

The tutor offers the simple way to return from the “P” or “PEN” state on some Sharps. Sometimes a student will bring me a Sharp calculator: “It’s not working…there’s that ‘P’ on the screen.” In another case, the screen might

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Lifestyle: Plant identification from field guide: wall lettuce

The tutor shares another yard find. I’ve noticed wall lettuce in the yard for at least ten years, but only recently identified it. In the right places, it grows fast. It’s a tall thin plant with leaves that hold the

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Web Design: JavaScript toggle

The tutor continues from yesterday’s example of dynamic content. In yesterday’s post I discussed how to change an element’s appearance on a page with JavaScript. Today, I’ll discuss how to change it back and forth. This paragraph’s style can be

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Web design: JavaScript: changing style of an element

The tutor returns to JavaScript to talk about changing element style. With JavaScript, the appearance of an element on the page can be changed by actions offered to the visitor. For example, the button below can be clicked to change

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Biology: digestive system: sphincters

The tutor discusses the use of sphincters in the digestive system. A sphincter is a ring of muscle that, when tightened, can restrict passage between two areas. The digestive system uses them at either end of the stomach. At the

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