A Sophie Germain prime is a prime number such that is also a prime number. That is, , where and are both prime. For example, . The sequence begins Sophie Germain () explored these primes [more…]
The potato is a native of the high Andes, a low-growing plant (Solanum tuberosum) with pretty purple flowers and round black fruits. To survive in its harsh environment it has evolved the habit of growing [more…]
You asked for it, dear Puffins! So here it is: another piece on one of my favourite subjects, the 1st D of W – this time about how he dealt with civil and other serpents. [more…]
Holograph Examples The PFG-01 holographic film that I’ve used in the examples below is ideally suited to making transmission holograms but it can also be used to make reflection holograms. Reflection Holograms One of the [more…]
A Simple Dual Beam Setup We’ve got our film, developer and a safety lamp. Now we need a holographic camera. Well, not exactly a camera. You can’t take a picture of rolling hills or a [more…]
A Holographic Camera Standard photography uses a lens system to focus an image onto a film or an electronic sensor. If you recall from part one, Dennis Gabor had a problem with his electron microscope’s [more…]
Introduction To the Looking-Glass world it was Alice that said, “I’ve a sceptre in hand, I’ve a crown on my head. Let the Looking-Glass creatures, whatever they be Come dine with the Red Queen, the [more…]
Today A Bear’s Diary is published as a hardback. It has been available as an ebook for a couple of months. It’s a shortish novel at 65,000 words, decorated with old engravings which give it [more…]
As any Puffin knows, I’m a card-carrying member of the ‘First Duke of Wellington Fan Club’. No, not because of his good looks, how very dare you! He’s dead, he is, more’s the pity – [more…]
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