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The photos were in black and white because until the switch to digital, most newspaper photos were *taken* with black & white film because it was much cheaper to process, and cheaper to print black & white in the paper.
It's *still* cheaper to print B&W. But with digital cameras, at least the original photo will be color.
Fri, 19:36: nox-artemis: did-you-kno: Source This was a topic in the only useful math class I’ve ever taken. In my case… http://t.co/3damZTviMk
Well calculators can fail. Also, a skill that math classes *can* teach you (but isn't emphasized nearly enough) is to get a feel for what the right answer should be. Not the exact numbers, but what "range" the answer should be in.
This avoids embarrassment or worse if you make a mistake in how you enter the numbers into the calculator.
That's one thing using slide rules was good for. It *required* you to keep track of how many places to the right/left of the decimal where involved and to figure how many the answer would have.
That meant you were a lot less likely to get answers that were ten, a hundred or a thousand times too big or two small.
Also,. even with a calculator, you need to know what numbers to put in and which operations to do on them. Calculators do arithmetic. Not math.
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Hint. That gate has a volume of 16,000 cubic feet. At 2 tons, each half would weigh only a couple of *ounces* per cubic foot each. Cotton balls weigh more than that.
If it was steel, it'd weigh around 1700 tons each.
Ipointed this out and also pointed out that a 2 ton chunk of steel would be a cube about 25 inches on a side.
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