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Richardson's ground squirrel (Urocitellus richardsonii), also known as the dakrat or flickertail, is a North American ground squirrel in the genus Urocitellus.Like a number of other ground squirrels, they are sometimes called prairie dogs or gophers, though the latter name belongs more strictly to the pocket gophers of family Geomyidae, and the former to members of the genus Cynomys.
As of December 2015, the propane retail cost was approximately $1.97 per gallon, [62] which meant filling a 500-gallon propane tank to 80% capacity costed $788, a 16.9% decrease or $160 less from November 2013. Similar regional differences in prices are present with the December 2015 EIA figure for the East Coast at $2.67 per gallon and the ...
The balanced equation shows to use 1 mole of propane for every 5 moles of oxygen. With air/fuel torches, since air contains about 21% oxygen, a very large ratio of air to fuel must be used to obtain the maximum flame temperature with air. If the propane does not receive enough oxygen, some of the carbon from the propane is left unburned.
Both bombs failed to detonate, so the two students opened fire anyway, killing 12 students and 1 teacher, and injuring 21 others before both committing suicide. Another 20-pound (9.1 kg) propane bomb was found south of the school, presumably as a diversionary device for the police. Other propane tanks were found in their cars, for use as car bombs.
The M44 was invented in the 1960s to replace a similar device known as a 'Coyote Getter', which had been in use since the 1930s. The Coyote Getter used a .38 Special pistol cartridge case to contain the sodium cyanide mixture, and ejected the cyanide with a primer.
In more recent times, traditional molecatching has given way to the use of poison. [5] [6] Poison resulted in moles dying much more quickly and in greater numbers.For some time, strychnine was used to kill moles; its purchase was cheaper than paying molecatchers, [7] but sometimes other animals that shared the environment or interacted with moles were accidentally poisoned as well.