Electronics: How relays work
By: Dan Ferrell
Since the 19th century, electro-mechanical relays have been built using different configurations and characteristics to suit different applications. Ever since, relays have been widely used in household appliances, computer interfaces, air and heating conditioning units, automobiles and in many other domestic and industrial electrical circuits...
By: Lorri B Smalls
While researching the radioactive decay of actinium-227, francium was discovered by Marguerite Perey in 1939 at the Curie Institute in Paris. The element’s name comes from its country of discoveryFranceand was the last naturally occurring element discovered by scientists. All other elements have subsequently...
Notable features of the constellation of Leo
By: Jose Juan Gutierrez
Leo is one of the 88 constellations that exist as group of stars in the sky and one of the twelve constellations of the zodiac, as well. The constellation Leo lies between the constellations Cancer and Virgo and about 40 degrees south of the Big...
Notable features of the constellation of Ursa Major
By: D. Vogt
Ursa Major, better known as the Great Bear, is a northern hemisphere star constellation. The notable features of Ursa Major include the stars of another well-known and easily recognizable constellation, the Big Dipper. Ursa Major was first identified as a constellation by the ancient Greek...
How to identify the constellation of Cassiopeia in the night sky
By: Jose Juan Gutierrez
Cassiopeia is one of the 88 constellations that have been classified in the night sky. Cassiopeia is best recognized by its resemblance to the letter w or M, depending on the time of the year. Given there are clear skies, Cassiopeia can be seen high...
How to identify the constellation of Leo in the night sky
By: Jose Juan Gutierrez
Leo is one among the 88 constellations that have been catalogued in the sky and it also forms part of the 13 constellation of the zodiac. Leo is a constellation that has been noticed by ancient civilizations, all of which related it to the figure...
Do you believe that aliens have already visited our planet?
By: John Traveler
The notion extraterrestrial beings have visited Earth is an intriguing enigma, and one fancied by human minds for at least the past hundred years. The very idea of extraterrestrial life only first breaching the mind of sixteenth century Copernican disciple Geordano Bruno, it has become...
What is Francium?
By: Trenna Sue Hiler
French physicist Marguerite Perey from the Curie Institute is credited for discovering francium. Perey was analyzing a particulate from the decay of actinium. As it turns out francium is a rate of the decaying process. The existence of the element had been a theory, it...
By: Dr. Bryan Katz
Ursa Major, or the Great Bear, is one of the most widely known of all the constellations. One reason is that Ursa Major is the third largest constellation in the sky and very difficult not to notice. A second reason is the seven brightest stars...
By: Dr. Bryan Katz
Orion, the Hunter, is perhaps the most widely recognized of all constellations. In Greek mythology, Orion was a mighty hunter who triumphed over the mightiest beasts but fell victim to the bite of a lowly scorpion. To acknowledge this, the gods placed Orion and the...

 

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