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By recording brain waves, the Mindwave Mobile can gauge emotion, improve mental math skills, or even control games.

Here, hacker-in-residence Nick Steele explores the different possibilities that come with access to neural data via the Mindwave Mobile.

Grand St.’s Nick Steele shows off the Mindwave Mobile

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The jsTar is a hacked version of the gTar Smart Guitar, an instrument/hardware hybrid that teaches you to jam along to your favorite tunes or compose with a wide range of compatible apps.

Here, hacker-in-residence Nick Steele explains how he hacked the gTar Smart Guitar to enable

awesome MIDI and 3D visualization stuff from within your browsers."

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Unreviewed Annotation 1 Contributor ?

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The Genius annotation is the work of the Genius Editorial project. Our editors and contributors collaborate to create the most interesting and informative explanation of any line of text. It’s also a work in progress, so leave a suggestion if this or any annotation is missing something.

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According to Marco Paglia and the Android Design Team,

Attention to detail makes an app truly beautiful: transitions are fast and clear, and layout and typography are crisp and meaningful. In this collection, we highlight a few beautiful apps with masterfully crafted design details.

The 11 “Most Beautiful Apps” chosen by Android

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Grand St. launched on Android in order to take advantage of the large and growing number of Android users out there.

According to co-founder and programmer Aaron Henshaw,

“Android’s growth is very compelling to us. In the past, developers didn’t focus on design in Android. The approach we’ve taken puts design at the forefront of the app. We wanted to make a high-quality iOS app but for Android.”

From inside the Grand St. Android app.

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Naithan Jones is referring to Ben Horowitz, a partner at Venture Capital firm Andreessen Horowitz and a frequent blogger.

Full Disclosure:

Andreessen Horowitz invested $15M in Rap Genius, and Ben Horowitz is “true fam”

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Bitcoin can be thought of as a very sophisticated, globally distributed, publicly available asset register.

This means that anyone can easily see the entire history of Bitcoins mined, rather than having a single authority, person, or company responsible for keeping watch.

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The concept of distributed proof of work is what makes Bitcoin special. The main problem of cryptocurrencies has been that while you can use cryptography to establish ownership of a digital asset, you can’t prevent that digital asset from being copied and used again and again (the double spend).

To prevent this, digital currencies have in the past required a third party to do both issuance and reconciliation of transactions to ensure that no one was doing unfair dealing.

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Every 10 minutes, the state of the network achieves consensus on a block, and the transactions up to that point are verified and agreed to at this point.

As consensus is achieved on a block, it strengthens the security of the previous block, building the security of the network as the network goes along.

The amount of computing power it would take to ‘break’ bitcoin in capital terms exceeds $400 million dollars. Just to break Bitcoin in terms of being able to calculate the proof of work faster than the rest of the network, with that, you would be able to fool the network for 10 minutes, and it would cost you $400 million , and for the next 10 mins you would have to continue to fool the network which would cost another $400 million in computing power.

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