3311418
09. February 2019
A single-ended triode (SET) is a vacuum tube electronic amplifier that uses a single triode to produce an output, in contrast to a push-pull amplifier which uses a pair of devices with antiphase inputs to generate an output with the wanted signals added and ...
Audion-sterling-blue.jpg
25903652
08. February 2019
Iazu is an impact crater located within the Meridiani Planum extraterrestrial plain, situated within the Margaritifer Sinus quadrangle (MC-19) region of the planet Mars. This geological feature is about 7 km in diameter. It is close to the landing site of the ...
Meridianicropped.pngMeridiani Planum PIA13704.jpgPancam super res sol 2239 Endeavour.jpgContext mapmerbsol2239.jpgMars Hubble.jpgEndeavour Crater Annotated 2009-03-07.jpg
10442027
07. February 2019
Eagle Grange No. 1 was organized on March 4, 1871 by a group of rural farmers who had become concerned about the rising costs of farming in the post Civil War economy. It is in Clinton Township, Lycoming County, Pennsylvania in the United States. Eagle Grange ...
USA Pennsylvania location map.svgEagle Grange.JPG
1367235
05. February 2019
The Regional District of East Kootenay (RDEK) is a regional district in the Canadian province of British Columbia, Canada. At the 2016 census, the population was 60,439. Its area is 27,542.69 square kilometres (10,641.16 sq mi). The regional district offices ...
Regional District of East Kootenay, British Columbia Location.pngBC-relief.pngCanada British Columbia location map.svg
43311128
04. February 2019
The Black Cove Formation is a geologic formation in Newfoundland and Labrador. It preserves fossils dating back to the Ordovician period. ...
The Earth seen from Apollo 17 with transparent background.pngAllosaurus Jardin des Plantes.pngRock Strata.jpg