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Give a penny, take a penny - that's the concept behind Jonathan Stark's new "experiment in social sharing." He has put a picture of his Starbucks card online so that anyone in the world can use his account to purchase a cup of coffee. Just save the photo on your smartphone, go to your local Starbucks, and scan the barcode. Simple as that. You'll have a free cup of piping hot coffee.

Humans are pretty good at rolling with short bursts of pressure, but chronic uncertainty throws us for a loop. Anticipating a major stressful event can be worse than the actual occurrence itself, research shows.  When we fear the hatchet will fall, when the future is a fog, when we're paralyzed by powerlessness, we start to flip out. We pile on more work than we can handle. We don't take sick days when we need them. We start fueling up on coffee and cigarettes, and dropping the things that are good for us, like leisure activities and trips to the gym. Under chronic stress, our immune systems start to buckle from "overresponsivity."