By John Tozzi

In this week’s Bloomberg Businessweek: a look at how one electronic health records company is using its data to get a broader understanding of public health trends.

Also online: more questions about what happens if small businesses shift to self-insurance; freelancers want to get paid too; and how new laws might pave the way for local investing.

This week in the magazine: how MIT engineers made solar cells out of paper, Saran wrap, and fabric.

Also online: a brief history of the home office tax deduction, a look at the SEC’s coming task in regulating crowdfunding, and a conversation with a food truck entrepreneur.

In this week’s Bloomberg Businessweek, my story on Ginger.io, a startup that uses mobile phone data to tell when people aren’t feeling well.

This week on Bloomberg.com: how EagleView uses aerial photography and software to measure rooftop dimensions remotely.

A recent innovator profile looks at how one company is using datamining to pick up signs of extreme weather weeks ahead of time.