Soleil couchant by ronan-follic http://ift.tt/193PFMP
On March 15, 1965, eight days following the the “Bloody Sunday” events at Selma, Alabama, President Lyndon B. Johnson spoke before a joint session of Congress, urging the passage of legislation that would become the Voting Rights Act of 1965:
LBJ’s speech urging passage of the Voting Rights Act. March 15, 1965.
See President Johnson’s reading copy of the speech at the National Archives Catalog.
Lake Clark National Park is a land of stunning beauty where volcanoes steam, salmon run, bears forage, craggy mountains reflect in shimmering turquoise lakes, and local people and culture still depend on the land and water of their home. Solitude is found around every bend in the river and shoulder of a mountain. Venture into the park to become part of the wilderness.
Photo of a brown bear by W. Hill (NPS)
“Between hens and penguins, it’s no doubt that we are suckers for cute animals in even cuter hand knit sweaters. These sweet little guinea pigs were featured on Cute Overload, sporting the handiwork of their loving owner, Savannah, and her sister Jillian.”
The Web is 25 today, and its inventor, Tim Berners-Lee, has called for a “Magna Carta” for the Web, through which the people of the world will articulate how they want to curtail their governments’ adversarial attacks on Internet freedom. Berners-Lee is particularly concerned with the Edward…
Large iron meteorite from meteor crater, Coconino County, Arizona: “From one of the most legendary impacts of all time, this meteorite’s gleaming surface contains scores of softened crests and ridges. Like all iron meteorites, this meteorite originated in the asteroid belt between Mars and Jupiter. Accompanied by a custom armature, this is a strapping example of the preeminent American meteor.” Oooh, it’s strapping! Like a hunky stable boy in a romance novel. Sold for $27,500.
A stunning tiny crystal of Calcite with inclusions of Mottramite.
Behold an expanding shell of debris called SNR 0519-69.0, left behind after a massive star exploded in the Large Magellanic Cloud: “Multimillion degree gas is seen in X-rays from Chandra, in blue. The outer edge of the explosion (red) and stars in the field of view are seen in visible light from the Hubble Space Telescope.”
Thermodynamics and P-V Diagrams
Paul Andersen explains how the First Law of Thermodynamics applies to an ideal gas in a piston. A pressure-volume graph can be used to determine the type of thermodynamic process. Included is a discussion of and P-V diagram for isothermal, isovolumetric, isobaric, and adiabatic process.
By: Bozeman Science.