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Individuals cannot travel between the populations , preventing the two populations from interbreeding . These are unsafe conditions for students who need to travel between the campuses after dark . There is a tradition , quoted in old Herbals , that if a handful of the plant be placed under the saddle , a horse is enabled to travel for some time without becoming hungry or thirsty , the Scythians having used this herb ( under the name of Hippice ) for that purpose . Then there is the thinking of the terrorist , whether the lone lunatic who hears God telling him to travel across a country planting home-made bombs in rural mailboxes along a highway , or a sophisticated , compartmentalized organization that has enormous wealth and resources at its disposal whether because it has the financial backing of a billionaire ideologue or the help of a rogue government seeking to destabilize its perceived enemies . All of the upstream transmissions from a cable modem travel across a single upstream data channel and are received by the CMTS . Commissioner authorises the use of the vehicle on the day and requires the transport to and from work of at least one other essential staff member from NSW Police , then the normal allowance and travel between the staff member ’ s residence and headquarters is to be paid . One reason migration changes Miraflores so completely is because the village is so small and because its migrants cluster residentially in the U.S. Communication and travel between the sending and receiving countries are relatively easy and inexpensive . Packet sniffing is the process of using an electronic device to capture data ( packets ) as they travel across a network . The links serve two roles : they form the energy circuit and allow you to travel between the joined planets , from the surface of one to orbit around the other and on into its core . This estimates the proportions of the total person trips , which use the available modes for travel between each pair of zones . She rejected it , however , and concluded that , from the time the state compliance order was issued until the MSHA withdrawal order was issued , the water accumulation remained at a level that continuously prevented safe travel by all persons through the primary escapeway . Gasoline fumes can travel across a room and be ignited by a water heater or some other ignition source .