... attractions. Such facilities employ a variety of devices, in-cluding heaters, pumps, filters, and controllers, to create a healthy environment for the living things residing in the aquarium, which ... key engineering function having many aspects ranging from developing new devices to addressing complex social issues using technology. In pur-suit of many such activities, engineers are called ... refrigerators capa-ble of achieving the low temperatures required by researchers. Freezers to support research requiring cryogenic temperatures in the low-gravity environment of the International...