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(1) These Pools Help Support Half The People On Earth. (6) Photoshop for Beginners. Unravelling the mystery behind the megalithic stone walls of Saksaywaman. Lying on the northern outskirts of the city of Cusco in Peru, lies the walled complex of Saksaywaman (Sacsayhuaman).

Unravelling the mystery behind the megalithic stone walls of Saksaywaman

The site is famed for its remarkable large dry stone walls with boulders carefully cut to fit together tightly without mortar. The stones used in the construction of the terraces at Saksaywaman, which weigh up to 200 tonnes, are among the largest used in any building in prehispanic America, and display a precision of fitting that is unmatched in the Americas. The stones are so closely spaced that a single piece of paper will not fit between many of the stones. Remote Viewing Test. Your Remote Viewing Ability One of the ways you can experience the Greater Reality is through remote viewing, a form of psychic ability very common among people.

Remote Viewing Test

Remote viewers "see" objects and scenes hundreds or thousands of miles away by closing their eyes and focusing on the object or place. Craig, author of this Web site, can do it. You may be able to do it. To test your remote viewing ability, follow the instructions below. If you would like to see how accurate remote viewers can be, click here to see some results of the Hawaii Remote Viewers Group viewings. A Remote Viewing Session by an Acknowledged Master. Astronomical Eponyms. Human beings have a seemingly infinite ability to rationalise the status quo. Robert Harrison.

Fun and Interesting Conversions. Fun and Interesting Conversions <blockquote><p><span><b>You do not have JavaScript enabled.

Fun and Interesting Conversions

</b></span><br /><span>The conversions on this site require the use of JavaScript so please enable before continuing. For assistance in enabling JavaScript, please contact the webmaster. </span></p></blockquote> International Friends If you chat or post with friends from different countries, you might find this useful. See also: Misc Conversions. A brief history of codebreaking: can you crack it?

Keith Harrison, contributor Read more: "Unbreakable: Eight codes we can't crack" Nothing is more beguiling than a secret.

A brief history of codebreaking: can you crack it?

It's why codebreaking has always fascinated us. The Mohorovicic Discontinuity - Mckenzie - 1969 - Geophysical Monograph Series - Wiley Online Library. How Small Is It - 02 - The Microscopic (1080p) Reiki Course Certified Advanced Practitioner Level 2. Blog. Cribbage Scores What is the distribution of all possible cribbage scores?


(And what is the connection between Cribbage and nuclear submarines?) Pancake Numbers A classic problem involving the optimal way to flip a stack of pancakes into sorted order using just a spatula (prefix reversal). A young Bill Gates co-wrote a paper on this, and his upper bound solution was the best known solution for almost 30 years! Holographic Replicators What is the chance of escaping from a pack of angry, laser toting, monsters using a holographic replicator? Geometric Mean Calculating geometric means in SQL server without using aggregate functions, and why widescreen TV aspect ratio is 16:9 Minimum Jeopardy What is the lowest, theoretical, score it is possible to score in a game of Jeopardy? Holographic Kinetics. What's the difference between RO and DI water purification? Reverse osmosis vs. deionized water - Labconco. People looking for the right Water Purification System often ask me, "What’s the difference between RO and DI water purification technologies?

What's the difference between RO and DI water purification? Reverse osmosis vs. deionized water - Labconco

" Here's the short answer: RO and DI filters use different physical reactions to clean water. Reverse Osmosis (RO) is often used to partially clean-up tap water to make it roughly 90% to 99% pure. Deionization (DI) filters exchange positive hydrogen and negative hydroxyl molecules for positive and negative contaminant molecules in water. DI filtering and other processes are sometimes referred to as "water polishing. " To answer the question more specifically, the individual technologies need to be understood. Direct current. Direct Current (red line).

Direct current

The vertical axis shows current or voltage and the horizontal 't' axis measures time and shows the zero value. The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage.[2][3] Direct current is used to charge batteries and as power supply for electronic systems. Very large quantities of direct-current power are used in production of aluminum and other electrochemical processes. It is also used for some railways, especially in urban areas. History[edit] Brush Electric Company's central power plant with dynamos generating direct current to power arc lamps for public lighting in New York. The late 1870s and early 1880s saw electricity starting to be generated at power stations.

Various definitions[edit] Although DC stands for "direct current", DC often refers to "constant polarity". Inverters: Modified sine wave vs. Pure sine wave. The main difference between pure sine wave and modified sine wave inverters is that the former produces a better and cleaner current.

Inverters: Modified sine wave vs. Pure sine wave

They’re more expensive, but for good reason. So what are the advantages? There are several: a) Output voltage wave form is pure sine wave with very low harmonic distortion and clean power like utility-supplied electricity. b) Inductive loads like microwave ovens and motors run faster, quieter and cooler with pure sine. c) Pure sine wave reduces audible and electrical noise in fans, fluorescent lights, audio amplifiers, TV, Game consoles, Fax, and answering machines. d) Pure sine wave prevents crashes in computers, weird print out, and glitches and noise in monitors. Alternating Current (AC) vs. Direct Current (DC) Thunderstruck!

Alternating Current (AC) vs. Direct Current (DC)

Where did the Australian rock band AC/DC get their name from? Why, Alternating Current and Direct Current, of course! Both AC and DC describe types of current flow in a circuit. Wire Gauges. Why?

Wire Gauges

The origin for the specification of the 'Gauge' of a wire is the number of dies that it has been pulled through - the higher the gauge, the more times it has been drawn. The (British) SWG, whilst a standard, was not quite linear in scale. As mentioned above, there is an alternate standard AWG (American Wire Gauge), and this follows a, much more pleasing, mathematical progression. Ratios As can be seen, in AWG, there is a constant ratio between each adjacent diameters. Wait, what?