dotracheal tube and are composed of inspiratory and expiratory corrugated limbs. The two breathing tubes carry respiratory gases with volatile anesthetics to and from patients during general anesthesia. Although longer corrugated breathing tubes allow the anesthesia machine to be located farther from the patients, they are so long and flexible that they tend to hang down below the operating tab...

Bangladesh is dominated by a small-holder agrarian economy under extreme stress. Production shortfalls, increasing economic polarization, and chronic malnutrition are persistent, but major famine has been diverted in part by significant growth in agriculture. This recent history is open to both Malthusian and Boserupian interpretations-a history we explore here through a test of the induced int...

John Remmers, MD, University of Calgary, Calgary Canada Conflict of interest: Zephyr Sleep Technologies employee and share holder Shouresh Charkhandeh, DDS, The Snore Center, Calgary Canada Conflict of interest: Zephyr Sleep Technologies share holder Joshua Grosse, MMath, Zephyr Sleep Technologies, Calgary Canada Conflict of interest: Zephyr Sleep Technologies employee and share holder Zbigniew...