Statistically, probability ranges from 0 to 1 — impossible to definitely without a doubt. Math with Bad Drawings characterized what those values mean in various fields of expertise. This amuses me.

Reddit user superemmjay tracked his weight for 20 months and plotted the measurements. The annotation makes interesting what would otherwise be just some graph of someone’s weight over time.

See also: eight years of dating, the fitbit during sex, the marriage proposal heartbeat, and the quantified breakup.

There’s “letting the data speak” and then there’s this, where people who are closely familiar with their own data explain what’s there with some simple notes. Those little pointers make a big difference for outsiders who don’t know the context of where the numbers come from.

Willard Cope Brinton is credited as one of the pioneers of information visualization, and I just found out his 1939 book Graphic Presentation is available in its entirety at the Internet Archive. You can download it in various formats. The book was an update to his previous book from 25 years prior, Graphic Methods for Presenting Facts. It’s also at the Archive.

It’s always fun to read through these older publications. Naturally, there’s the historical significance and pretty graphs, along with tidbits on printing processes and paper (whatever those are).

But they talk about a lot of the same stuff that we do now—perception, narratives, attention, and all that—which always catches me off guard because we tend to think of visualization as this relatively new thing. Then it’s like oh wait, someone did this more than a century ago.

Nicky Case made an interactive explanation of how neurons work. It’s part narrated video and part game.

But the most important concept I wanted to introduce here was exposure therapy, which is part of Cognitive Behavioral Therapy. CBT is basically being mindful of your crappy neural connections, and gaining skills to retrain those connections.

I like how Case’s narrated responses change depending on what and how you click. It feels like he’s sitting there next to you.

You’ll want to set aside a bit of time to click through. It’s on the long-ish side by internet standards, and there’s no way to pick up where you left off if you come back to it later. Or, you can download the open source code and do it yourself.

Dan Burns explains some properties of time and space using marbles and two large pieces of spandex sewn together in a classroom demonstration.
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Trey Causey just finished an interview roundabout for data science jobs. He outlines his experiences and describes what interviewers seem to want, what questions to expect, and what to expect from yourself.

Sooner or later you’re going to find yourself looking for a data science job. Maybe it’s your first one or maybe you’re changing jobs. Even if you’re fully confident in your skills, have no impostor syndrome, and have tons of inside leads at great companies, it’s a tremendously stressful experience. The process of looking for a new job is often one that occurs secretly and confidentially and then is so exhausting that discussing the process is the last thing you want to do. I hope to change that.

A must-read for those about to get your feet wet.

See also Causey’s short guide on getting started with data science.

In a clean and simple set of slope charts, Alyson Hurt for NPR shows the shifts in power sources — coal, gas, nuclear, hydroelectric, and renewables — from 2004 to 2014. As you might guess, coal power output is down in most states and natural gas is up. On a national scale, the hydroelectric and renewable sources need more time.

Grab the data from the U.S. Energy Information Administration to look yourself.

Luis Dilger made a set of fine-looking prints that show city landscapes in 3-D. They look like little cardboard cutouts.
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You know the thing. It’s the triangle of numbers that you learned about in high school. Each number in a row is the sum of the two numbers above it in the previous row. Of course, as explained in the video below, there’s more to it than that. SECRETS REVEALED.

[via kottke]

It is estimated that over 200,000 people have been killed during the Syrian civil war. That’s a lot of lives. Lives. In a striking representation by the New York Times, a dot represents each life lost.

In a very non-government-like release (in a good way), the U.S. Department of Education provides detailed data for college debt, graduation rates, test scores, and more. It’s at the program-level, and there’s even a front-facing College Scorecard that lets you look up information for your university.

And it doesn’t look and work like an outdated government site. With all of my frustrations with government sites, the education release feels pretty great. It’s as if the department actually wants us to look at the data. Imagine that.

You can download the data as a single ZIP file, access it via the data.gov API, and most importantly, there’s documentation.

Seriously, this is good stuff, and if it’s any indicator for where government data is headed, there could be good things to come.

So you have your data neat and tidy in a single spreadsheet, and it’s finally time to explore. There’s a problem though. Maybe you don’t know what to look for or where to start. Maybe you’re not in the mood for a trip to clicksville to make all those charts. With a new exploration tab, Google Sheets might be a good place to start.
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Here’s a fun project to try over the weekend. Hannah Mitt and Andrew Morrison came up with a neat hack using an old Android device and a two-way mirror to make a future-y information display. It shows date, time, and weather, reminders, and the most recent xkcd.

Just import their project to your device, mount it to the mirror, and mount the whole thing to the wall. Done.

There are a lot of trees on this planet. But how many trees there actually are is still kind of fuzzy, because the estimates are based on satellite imagery. It’s hard to gauge density. Research by T. W. Crowther et al., recently published in Nature, used on-the-ground sampling to estimate more accurately.

The global extent and distribution of forest trees is central to our understanding of the terrestrial biosphere. We provide the first spatially continuous map of forest tree density at a global scale. This map reveals that the global number of trees is approximately 3.04 trillion, an order of magnitude higher than the previous estimate. Of these trees, approximately 1.39 trillion exist in tropical and subtropical forests, with 0.74 trillion in boreal regions and 0.61 trillion in temperate regions.

Apps peak and die on a regular basis. One day everyone is giving an app a go and your feed fills up with links to the service, and the next it’s business as usual. BuzzFeed took a straightforward look at such trends through the eyes of tweets. All they had to do was count tweets that linked to particular service over time.