All I ever want in life is for an ATM to spit out an extra 20 dollar bill one time. This never happens! Vending machines have given me two bags of chips. I’ve gotten an extra chicken nugget here and there. Sometimes even the glorious onion ring in an order of fries. But the cash machine never messes up for me. Here’s how it manages to do that: with a series of rollers—some serrated, some smooth—that send the bill to a conveyor belt to get scanned with a sensor. Read more…
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How Do ATMs Always Give the Right Amount of Bills Each Time?
An anonymous reader writes: It may come as a surprise to many, but the 20-year-old Compaq LTE 5280 still plays a vital role in maintaining multi-million dollar McLaren F1s. Jalopnik recently visited McLaren’s Special Operations workshop where it found several of Compaq’s old laptops serving their masters. Why do they rely on these dated computers, you ask? A McLaren Special Operations staff explains, “The reason we need those specific Compaq laptops is that they run a bespoke CA card which is installed into them. The CA card is an interface between the laptop software (which is DOS based) and the car. We are currently working on a new interface which will be compatible with modern laptops as the old Compaqs are getting less and less reliable and harder to find.” For those wondering, the Compaq LTE 5280 comes with a 120MHz Intel Pentium processor, up to “80MB” of RAM, and up to 16MB of HDD. Read more of this story at Slashdot. 
HughPickens.com writes: Ed Davey has an interesting story at BBC about the proposed nuclear plant at Hinkley Point in Somerset, UK which at $35 billion will be the most expensive object ever put together on Earth. For that sum you could build a small forest of Burj Khalifas — the world’s tallest building, in Dubai, which each cost $1.5 billion. You could build almost six Large Hadron Colliders, built under the border between France and Switzerland to unlock the secrets of the universe, and at a cost a mere $5.8 billion. Or you could build five Oakland Bay Bridges in San Francisco, designed to withstand the strongest earthquake seismologists would expect within the next 1, 500 years at a cost of $6.5 billion… But what about historical buildings like the the pyramids. Although working out the cost of something built more than 4, 500 years ago presents numerous challenges, in 2012 the Turner Construction Company estimated it could build the Great Pyramid of Giza for $5 billion. That includes about $730 million for stone and $58 million for 12 cranes. Labor is a minor cost as it is projected that a mere staff of 600 would be necessary. In contrast, it took 20, 000 people to build the original pyramid with a total of 77.6 million days’ labor. Using the current Egyptian minimum wage of $5.73 a day, that gives a labor cost of $445 million. But whatever the most expensive object on Earth is, up in the sky is something that eclipses all of these things. The International Space Station. Price tag: $110 billion. Read more of this story at Slashdot. 
An anonymous reader writes: Humble Bundle announced a special “pay what you want” sale for four ebooks from No Starch Press, with proceeds going to the Electronic Frontier Foundation (or to the charity of your choice). This “hacker edition” sale includes two relatively new titles from 2015 — “Automate the Boring Stuff with Python” and Violet Blue’s “Smart Girl’s Guide to Privacy, ” as well as “Hacking the Xbox: An Introduction to Reverse Engineering” by Andrew “bunnie” Huang, and “The Linux Command Line”. Hackers who are willing to pay “more than the average” — currently $14.87 — can also unlock a set of five more books, which includes “The Maker’s Guide to the Zombie Apocalypse: Defend Your Base with Simple Circuits, Arduino, and Raspberry Pi”. (This level also includes “Bitcoin for the Befuddled” and “Designing BSD Rootkits: An Introduction to Kernel Hacking”.) And at the $15 level — just 13 cents more — four additional books are unlocked. “Practical Malware Analysis: The Hands-On Guide to Dissecting Malicious Software” is available at this level, as well as “Hacking: The Art of Exploitation” and “Black Hat Python.” Nice to see they’ve already sold 28, 506 bundles, which are DRM-free and available in PDF, EPUB, and MOBI format. (I still remember Slashdot’s 2012 interview with Make magazine’s Andrew “bunnie” Huang, who Samzenpus described as “one of the most famous hardware and software hackers in the world.”) Read more of this story at Slashdot.