A window is configured to bring nature into the interior of a building in a true physical sense. Zero fuel time may be determined based on a fuel burn rate and an amount of remaining fuel. The device includes actuation switches which also allow linehead spool hubs to be used in an independent manner. The modules have input and output ports which are interrelated by binding information. An absence of the charge carriers within the array of nanocrystals represents a second logic state of the memory device. The apparatus further includes a safety valve configured to release a part of liquefied natural gas contained in the tank when a vapor pressure of liquefied natural gas within the tank becomes higher than a cut off pressure.