Events around the world this week: Spain, UK, and around the U.S.(not just the coasts).

We spotted Tom Lee’s Lobbyist Registration Meter video on YouTube this morning and it made our day. Lee, director of the Sunlight Foundation’s Sunlight Labs, used an old voltmeter, a Raspberry Pi, and Sunlight Foundation data to create a meter that physically displays the number of new lobbyist registrations in Washington, DC. Lee very kindly agreed to answer a few questions about his setup and the data behind it.

Derek Willis mines government mobile apps to liberate data and issues a call to arms for collaboration.

At The Boston Globe, I was charged with helping readers understand that struggle—to experience a night in the life of a cab driver—using a digital interactive. The result was published alongside an amazing article by the Globe’s resident journalist-sportswriter-cabbie, Bob Hohler.

Today, John Keefe will teach data visualization basics in New Jersey. This week, the Global Editors Network Editors’ Lab heads to Cairo.

The NYT’s Tiff Fehr on figuring out what Olympics fans expected and how her team made them happy.

This week, MinnPost launched an effort to track legislation in Minnesota throughout the 2013 session.

A new PDF data extraction tool conceived by Manuel Aristarán and built out in a collaboration between Aristarán, who is a Knight-Mozilla Fellow at La Nación, and Mike Tigas, Fellow at ProPublica, and ProPublica’s Jeremy B. Merrill.

Applications open this week for Code with me: Portland. Plus, National Conference for Media Reform this weekend.

Jacob Harris explains the perils of making government food safety data usable for journalistic research.

Hacks/Hackers meetups in Rochester, Berlin, and Boston this week. Plus, today is the last day to apply for Grants for Innovation in Development Reporting.

It’s been a fruitful couple of weeks for news apps and people writing about them: this roundup brings a sturdy batch of new features and tools and about twice as many write-ups as usual.

The Knight News Challenge deadline is today Tuesday at 5pm Eastern Daylight Time. (Due to technical difficulties, the deadline has been extended one day.)

Open Gender Tracker is an open source deployable content analysis service funded by a Knight Foundation Prototype grant. We spoke with its creators about the project’s origins, technical specifications, and possible future in and near newsrooms.

Today, we launched OpenNews Learning, a brand-new kind of awesomeness hosted here on Source. We’re opening with three crunchy case studies from three heavy hitters.

Matt Waite on how using mug shots of recently arrested perps lead to a cascading set of ethical quandaries.

First in a three-part series by Adrian Holovaty about hairy data-parsing problems from a journalist’s perspective

One week left to think of your entry for the Knight News Challenge. Plus, lots of Hacks/Hackers meetups worldwide.

In the third of our Knight International Journalism Fellow profiles, Mariano Blejman talks about his upcoming projects.

Conference season is gearing up: Last week NICAR, this week SXSW Interactive.