Big money . Want to get rich? Invent a biodegradable ink . With such chemistry, errant youths could have all the tattoos they desire, and not suffer their whole lives with visible proof of temporary insanity. Bigger money . You see Facebook ,Twitter, Instagram, and the like as social apps . It seems that modernity has an unlimited appetite for such apps. These transcend the now ancient letter, morning coffee, and telephone conversation by miles, even light years. Create a new such app. Easy to say, difficult to do,but the rewards are extravagant. Really big money . We know the national debt (in 2015) is about 19 trillion dollars. A lot of money this is. But what does it mean? We are crossing scales or orders of magnitude, and this is difficult for almost all people. Suppose I said that a lifetime is about two billion seconds. (Actually, 2.2 billion seconds.) This is a magnitude of such a value to make it incomprehensible by any measure. But when I say
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