To USB or Not to USB


USB Killer

USB Killer

I’ve spent a week learning about our ARC processors and Security products and how we can build trusted environments inside the PC using hardware and software to prevent security breaches.

It turns out you can disable an electronic device through it’s USB port.  (Probably possible through any port, but let’s focus on USB).  All you do is run a high-voltage


I ran into a product called USB Killer, that will kill your computer for you.  It’s commercially available at


According to their website more than 95% of devices tested are vulnerable to this kind of attack. You can watch them kill a Lenovo laptop.

On their blog, they state that Apple is the only company to implement protection against this kind of attack.


They also sell a device called “USB Killer Test Shield” to see if the product is vulnerable to this kind of attack (or at least the USB Killer that they created to sell).  The same Shield can be used when you are charging at a public charging station, and you want to make sure that no data is being sent to the data charging station.  (I’m imagining that all the free charging stations in the Airport are sending your data to the Russian mob when you are charging and drinking your $12 dollar coffee with a $10 danish)

The point is, Security is important and certainly this kind of physical attack can be prevented for what I’m guessing is less than $1 of parts in a laptop PC (or TV or tablet)

Here’s the source for the article that led me to this company.

I thought for awhile if I should blog about this.  I find it fascinating, and the more manufacturers know, the better they can protect their products.  Something everyone should be doing anyways)

To Subscribe, click on the icons below (after the jokes)

 A Statistician is a Mathematician without the personality to be an Accountant.

(Please, Accountants, don’t send me hate mail)

Here are jokes I have taken wholesale from


Three statisticians go out hunting together. After a while they spot a solitary rabbit. The first statistician takes aim and overshoots. The second aims and undershoots. The third shouts out “We got him!”

Source: chjilloutdamnit / Reddit



Two random variables were talking in a bar. They thought they were being discrete but I heard their chatter continuously.

Source: armchairdetective /  reddit 

Explanation: When you roll a die, you either get a 1, 2, 3, 4, 5, or 6. Since there are a finite number of possibilities, the statistic involved is called a discrete random variable. When you select any real number from between 0 and 1, there are an infinite number of possible draws. The statistic involved is called a continuous random variable.


JOKE #3 

There was a statistician that drowned crossing a river… It was 3 feet deep on average.

Source: anatiferous_outlaw / reddit


Write the expression for the volume of a thick crust pizza with height “a” and radius “z”.

Source: Reddit

Explanation: The formula for volume is π·(radius)2·(height). In this case, pi·z·z·a.


JOKE #5 

A: “What is the integral of 1/cabin?”

B: “log cabin.”

A: “Nope, houseboat–you forgot the C.”

Source: Reddit

Explanation: We’re treating “cabin” is a variable.

The integral of 1/x is loge(x).

However, since it’s integration, you’ve got to add a constant.

So ∫(1/cabin) = loge(cabin) + c, or “a log cabin plus the sea.”


math proofAlgebra. By Serge Lang

Q: Why did the chicken cross the road?

A: The answer is trivial and is left as an exercise for the reader.

Source: Reddit


This is a common refrain found in mathematics texts.

It is widely considered a cruel professor’s malicious cop-out by particularly lazy students of mathematics.


JOKE #7 

Q: How many mathematicians does it take to change a light bulb?

A: One: she gives it to three physicists, thus reducing it to a problem that has already been solved.

Source: MathOverflow

Explanation: Mathematicians try to reduce an unsolved problem to a form which has already been solved before. Once that’s done it’s considered complete, as the previously derived formula is taken as written.

There are many light bulb jokes about physicists. Finding several are left as an exercises to the reader.

JOKE #8 

A physicist, a biologist, and a mathematician are sitting on a bench across from a house. They watch as two people go into the house, and then a little later, three people walk out.

The physicist says, “The initial measurement was incorrect.”

The biologist says, “They must have reproduced.”

And the mathematician says, “If exactly one person enters that house, it will be empty.”

Source: Reddit

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