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Math in Your Head

I often find myself doing math in my head, and people are shocked and amazed that I can quickly come up with an answer without using a calculator.  I should probably be the one who is shocked that so few people can do simple math in their heads.  Then again, someone who does high level mathematics is not necessarily good at arithmetic. I suppose the logic comes easy for a programmer, but the trick to solving complex problems is to break them down into simpler operations. Multiplication Multiplication is really addition, multiple times. 10 x 3 = 10 + 10 + 10 = 30 One common problem is percentages. Percentage Percentage is really a division or multiplication problem, depending on how you look at it. What is 20 percent of 120? There are several ways to approach such problems, and I don't always use the same method. Method 1 Sometimes it is easier to break things up into 10's 100's or multiples of 2. 120 = 100 + 20 So work on each portion separately...
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Apple Cider Vinegar - Nutritious, sure, but Delicious?

You may have heard people the talk about the health benefits of apple cider vinegar, but it doesn't sound very appetizing to drink.  Think about it, do you drink pure lemon juice, or do you make lemonade? Scott's Lemonade 1 Cup Fresh Squeezed Lemon Juice 1 Cup Pure Cane Sugar 6 Cups Water Optional: Serve over Ice Note: Packages labeled "Sugar" instead of "Pure Cane Sugar", are likely Genetically Modified Beet Sugar, instead of Cane Sugar. Bragg Organic Vinegar Health Drink 1-2 tsps Bragg Organic Apple Cider Vinegar in 8 oz. glass of purified or distilled water and (optional) to taste 1 to 2 tsps Organic Honey, 100% Maple Syrup, or 4 drops of herb Stevia. Delicious, ideal pick-me-up at home, work, sports or gym. Perfect 3 times daily, upon arising, mid-morning and mid-afternoon From the bragg.com website:   http://bragg.com/products/bragg-organic-apple-cider-vinegar.html Scott's Apple Cider Vinegar Drink 2 tsp Bragg Organic Appl...
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Drive: The surprising truth about what motivates us

This "RSA Animate" provides some insight into what drives software engineers to create software such as Linux, and give it away for free.  This seems to imply that giving back is a reward in itself, but in the back of the developer's mind there could also be the idea that he may become famous some day, and that the money will follow.  As a systems administrator / developer, I tend to agree with the idea that becoming an expert does not always require any compensation, and it feels good to help fellow sysadmins and computer users.  The knowledge itself is valuable, and can be turned into a business at some point.  For example practicing a musical instrument, or learning to cook well for no monetary reward can be fun, but is also something to fall back on.  RSA Animate - Drive: The surprising truth about what motivates us This lively RSA Animate, adapted from Dan Pink's talk at the RSA, illustrates the hidden truths behind what really motivates us at...
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