25 OCT 2017 by ideonexus

 Blockchains

Ownership on the Bitcoin blockchain is determined by a pair of cryptographic keys. The first, called the public key, resides in the blockchain for anyone to see. The second is called the private key, and its owner keeps it safe from view. The two keys have a special mathematical relationship that makes them useful for signing digital messages. Here’s how that happens: Helmut takes a message, combines it with his private key, does some calculations, and ends up with a long number. Anyone who...
Folksonomies: blockchains technology
Folksonomies: blockchains technology
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24 JAN 2014 by ideonexus

 Knowing One Thing Well is Barbaric

To know only one thing well is to have a barbaric mind: civilization implies the graceful relation of all varieties of experience to a central humane system of thought. The present age is peculiarly barbaric: introduce, say, a Hebrew scholar to an ichthyologist or an authority on Danish place names and the pair of them would have no single topic in common but the weather or the war (if there happened to be a war in progress, which is usual in this barbaric age).
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The enlightened mind knows many things, specialization means we live among many barbarians.

13 APR 2013 by ideonexus

 Freestyle Chess

In fact, the best game of chess in the world right now might be played neither by man nor machine.47 In 2005, the Web site ChessBase.com, hosted a “freestyle” chess tournament: players were free to supplement their own insight with any computer program or programs that they liked, and to solicit advice over the Internet. Although several grandmasters entered the tournament, it was won neither by the strongest human players nor by those using the most highly regarded software, but by a pai...
Folksonomies: games chess
Folksonomies: games chess
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Similar to correspondence chess, where computer programs are allowed to offer suggestions and the players act like coaches directing the moves.

09 MAY 2012 by ideonexus

 On Atoms Sharing Electrons

Saying that each of two atoms can attain closed electron shells by sharing a pair of electrons is equivalent to saying that husband and wife, by having a total of two dollars in a joint account and each having six dollars in individual bank accounts, have eight dollars apiece!
Folksonomies: metaphor intuition
Folksonomies: metaphor intuition
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The idea that by sharing electrons they close their shells seems absurd.

18 MAR 2012 by ideonexus

 Did Adam and Eve have Navels?

All other men, being born of woman, have a navel, by reason of the umbilical vessels inserted into it, which from the placenta carry nourishment to children in the womb of their mothers; but it could not be so with our first parents. It cannot be believed that God gave them navels which would have been altogether useless.
Folksonomies: bible creationism
Folksonomies: bible creationism
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The navel is a scar from the umbilical cord. So no; yet the pair is almost always depicted with belly buttons.

01 JAN 2012 by ideonexus

 Newton's Experiment Proving White Contains All Colors

Newton wasn't the first person to make a rainbow with a prism. Other people had already got the same result. But many of them thought the prism somehow 'coloured' the white light, like adding a dye. Newton's idea was quite different. He thought that white light was a mixture of all the colours, and the prism was just separating them from each other. He was right, and he proved it with a pair of neat experiments. First, he took his prism, as before, and stuck a narrow slit in the way of the co...
Folksonomies: experiments prism spectrum
Folksonomies: experiments prism spectrum
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Using a prism to split light into a rainbow, he then used a lens to merge the rainbow back into white light and split it apart again.

05 JUN 2011 by ideonexus

 A Unique Statement of the Law of Universal Gravitation

The relative interattractiveness invisibly operative between any two remote-from-one-another cosmic bodies, as compared to any other pair of cosmic bodies, equally distanced from one another, is proportional to the multiplicative product of the respective couple's masses, and the interattractiveness of any pair of celestial bodies varies inversely as the second power of the distance between them. Halve the intervening distance and the interattractiveness increases fourfold.
Folksonomies: gravity theory law
Folksonomies: gravity theory law
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That does not use the word "Gravity".

11 APR 2011 by ideonexus

 The Fascinating Ability of Humans to Walk Upright

We stand upright-after a little practice-on a ship that rolls because we possess an array of sensory nerve cells buried in our muscles, skin, and joints. The function of these sensors is to provide a constant flow of information to the brain about the movements and location in space of the various parts of our bodies, as well as the environmental forces currently acting on them. We also have a pair of balance organs associated with our ears which work like spirit-levels, each having a bubble ...
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A wonderful description of everything that goes into the process of walking and standing upright.

05 APR 2011 by ideonexus

 The Consolation of Seeing the World Through Science

But what good does it do me to think of the universe as an unthinking mechanism vast beyond comprehension? It gives me the consolation of believing I conceive it as it really is. It makes me thankful that I can conceive it at all. I could have been a pair of ragged claws, scuttling across the floors of silent seas. In this connection I find the Theory of Evolution a great consolation. It helps me understand how life came about and how I came to be. It reveals a logical principle I believe app...
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Seeing the world as it really is.