If you ever wondered why blueprints were blue and not black or red or white or brown or any other color than blue, well, it's not because architects really like the color but because the technique in making blueprints caused the paper to turn blue.
Mental Floss delved into the history of blueprints and discovered that the blueprint process was developed in the 1800's when scientists found an easy way to reproduce documents by using ammonium iron citrate and potassium ferrocyanide as some sort of old school photocopy. How does that really work? Well, as Mental Floss explains it:
Someone creates a drawing on translucent tracing paper or cloth. The drawing is placed over a piece of blueprinting paper, which has been coated with a mix of ammonium iron citrate and potassium ferrocyanide from an aqueous solution and dried. When the two papers are exposed to a bright light, the two chemicals react to form an insoluble blue compound called blue ferric ferrocyanide (also known as Prussian Blue), except where the blueprinting paper was covered, and the light blocked, by the lines of the original drawing. After the paper is washed and dried to keep those lines from exposing, you're left with a negative image of white (or whatever color the blueprint paper originally was) against a dark blue background.
You see, the chemicals react and makes the paper blue. And back in the day, using this blueprinting technique was obviously faster and more effective than tracing the documents. The blueprint name has stuck ever since. The more you know, right.
Nine years and 19 million YouTube views later, Steve Jobs's commencement address to Stanford University's graduating class of 2005 has achieved iconic status.Jobs, the Apple visionary who died in 2011 at age 56, delivered a speech that resonated far beyond the Stanford audience, with a masterful mix of personal anecdotes, sparks of insight and universally applicable pieces of wisdom. Each year, especially around graduation season, people discover and rediscover Jobs's speech and its messages for those who seek meaning and purpose in life and at work. - Carolyn GregoireNote that Steve Jobs originally asked Screenwriter Aaron Sorkin to write this speech: Sorkin was not available. - DJKFull text of Steve Jobs' commencement address to Stanford University 2005 "I am honored to be with you today at your commencement from one of the finest universities in the world. I never graduated from college. Truth be told, this is the closest I've ever gotten to a college gradu…
Dinner Is Printed
By A. J. JACOBS - New York Times
THE hype over 3-D printing intensifies by the day. Will it save the world? Will it bring on the apocalypse, with millions manufacturing their own AK-47s? Or is it all an absurd hubbub about a machine that spits out chintzy plastic trinkets? I decided to investigate. My plan: I would immerse myself in the world of 3-D printing. I would live for a week using nothing but 3-D-printed objects — toothbrushes, furniture, bicycles, vitamin pills — in order to judge the technology’s potential and pitfalls.
I approached Hod Lipson, a Cornell engineering professor and one of the nation’s top 3-D printing experts, with my idea. He thought it sounded like a great project. It would cost me a mere $50,000 or so.
Unless I was going to 3-D print counterfeit Fabergé eggs for the black market, I’d need a Plan B.
Which is how I settled on the idea of creating a 3-D-printed meal. I’d make 3-D-printed plates, forks, place mats, napkin rings, candlesticks —…