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When you measure BPA levels based on a lifetime of daily exposure, it turns out our bodies are full of the poisonous stuff. BPA is practically inescapable--it's found in soup cans, water bottles, store receipts, dental linings, plastic-packaged foods, and any number of other products. Canada has already declared that BPA is a toxic substance, and the stuff has been banned in baby bottles in Europe, China, and Canada, but we're still exposed to BPA constantly.

Groupon is burning through cash. In January, it raised about $950 million; by March, it had just $209 million left

Webcomic XKCD has timed today's piece nicely, given how much the (i)cloud will be in the news this week... 1. Sony, for once, isn't in the hacking news this morning: Instead game making rival Nintendo is now reporting a serious attack on its servers.

Let's begin with the biggest news of the day: Groupon 's CEO makes 575 times what Steve Jobs makes as chief exec at Apple.

Summer hours can be a perk with more bang for your buck than more traditional employee benefits.

Lady Gaga is hot property in terms of brand promotion, meaning Amazon's pulled off a huge coup: It's offering her new album for just $0.99. As part of the deal, you get free access to 20GB of Amazon's new (unlicensed?) cloud music locker--a service that normally costs $20 per year

Can laughs make the sale? Plus, the new deal-site ecosystem, loving the Like button, and the rest of the day's news for entrepreneurs. Each day, Inc.'s reporters scour the Web for the most important and interesting news to entrepreneurs

Groupon has already conquered the daily deals market--now they're trying to take over all other deals, too. But they may be missing one big piece of the puzzle: a social network. Groupon has already conquered the daily deals market--now they're trying to take over all other deals, too

The end of the world's tomorrow, say some. Want to make a buck off it?

Mississippi River flooding is at its worst in decades. With thousands evacuated and the levees breaking, the Army Corps of Engineers has begun an audacious Facebook initiative to keep the public informed.

For working women on the go, MyDailyMoment is a one-stop shop for everything fitness, beauty, recipes, and more. As we process applications for the 2011 Inc.

May is Small Business Month, and to celebrate we're honoring 31 inspiring stories of small business success. Here's a look at ten of them. Chris Zane is in the experience business

Use continuous updates and punchy messages to heighten interest and keep your customers informed about products or services which in turn can boost sales.

In light of Mark S. Zuckerberg losing his Facebook page, we examine some of the regular (or not-quite-regular) folk who share names with the titans of tech innovation

Have you ever had the experience of buying a deal from Groupon or LivingSocial, getting to the merchant (a restaurant, let's say), and awkwardly giving the server a crumpled piece of paper to prove that you deserve $20 worth of food for just $10?