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2. These are the 10 best Amazon Black Friday deals on Kindles ...

   www.engadget.com/these-are-the-10-best-amazon...

   Amazon started its Black Friday deals early this year, and many Amazon devices are on sale right now. We sifted through the sale and selected standout deals on Amazon Kindles, Fire TV sticks, Echo ...

3. Amazon Black Friday deals include the Dyson Airwrap for its ...

   www.engadget.com/amazon-black-friday-deals...

   Dyson. Amazon has the Dyson Airwrap on sale for a record low. The innovative styling tool uses air rather than extreme heat to dry and shape hair — potentially boosting your hair’s long-term ...

4. IDnow Scans Holograms In ID Cards To Verify Your Identity ...

   techcrunch.com/2014/06/18/idnow-scans-holograms...

   First you take a photo of your ID document. An IDNow app uses the flash light of your smartphone to illuminate the official government ID and its hologram. The hologram reflect in the flash light ...

5. Security printing - Wikipedia

   en.wikipedia.org/wiki/Security_printing

   Security printing. Security printing is the field of the printing industry that deals with the printing of items such as banknotes, cheques, passports, tamper-evident labels, security tapes, product authentication, stock certificates, postage stamps and identity cards. The main goal of security printing is to prevent forgery, tampering, or ...

6. Physics of optical holography - Wikipedia

   en.wikipedia.org/wiki/Physics_of_Optical_Holography

   Embossed holograms are used widely on credit cards, banknotes, and high value products for authentication purposes. [3] It is possible to print holograms directly into steel using a sheet explosive charge to create the required surface relief. [15] The Royal Canadian Mint produces holographic gold and silver coinage through a complex stamping ...

7. Holography - Wikipedia

   en.wikipedia.org/wiki/Holography

   Holography. Holography is a technique that enables a wavefront to be recorded and later reconstructed. It is best known as a method of generating three-dimensional images, and has a wide range of other uses, including data storage, microscopy, and interferometry. In principle, it is possible to make a hologram for any type of wave .