OBJECTIVE To study sleep parameters and mood profiles of a female explorer traveling solo and unaided to the South Pole during the winter. METHODS During the 44-day expedition, global activity and sleep were assessed using a wrist actigraph (AW) worn on the nondominant wrist. Mood was assessed using an adapted Profile of Mood States questionnaire. Pre- and post expedition physiologic profiles...

We investigate a class of multiagent planning problems termed multiagent expedition, where agents move around an open, unknown, partially observable, stochastic, and physical environment, in pursuit of multiple and alternative goals of different utility. Optimal planning in multiagent expedition is highly intractable.We introduce the notion of conditional optimality, decompose the task into a s...

In the present study, we investigated the effect of a long-term mountain expedition on glucose tolerance and insulin action. Twelve registered mountaineers ages 31 years (SD = 1.1) participated in a 25-day expedition at a 2,200-3,800-m altitude with an average duration of 8 hr per day. Arterial oxygen saturation (SaO2) was substantially reduced during hiking. Glucose tolerance and insulin respo...

The Chicxulub impact crater in Mexico is unique. It is the only known terrestrial impact structure that has been directly linked to a mass extinction event and the only terrestrial impact with a global ejecta layer. Of the three largest impact structures on Earth, Chicxulub is the best preserved. Chicxulub is also the only known terrestrial impact structure with an intact, unequivocal topograph...

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Setting, planning, and goals. . . . . . . . . . . . . . . 1 Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Results and discussion. . . . . . . . . . . . . . . . . . . . 7 Summary and conclusions. . . . . . . . . . . . . . . . 15 Acknowledgments. . . . . . . . . . . . . . . . . . . . . . 16 References . . . . . ...

Integrated Ocean Drilling Program (IODP) Expedition 333 returned to two sites drilled during IODP Expedition 322 on the ocean side of the Nankai Trough to pursue the characterization of the inputs to the Nankai subduction and seismogenic zone, as part of the Nankai Trough Seismogenic Experiment (NanTroSEIZE) multi-expedition project. Site C0011 is located at the seaward edge of the trench and S...

Henry M. Stanley, in his second trans-Africa expedition of 1874– 1877, lost 68% of his 356 men. Among the casualties, 58 died in battle or were murdered (several were cannibalized), 45 died of smallpox, 21 from dysentery, 14 drowned, and 1 was killed by a crocodile; several others died of starvation (all of this from the preface to this book). Modern-day expeditions—defined as organized and usu...

Until recently the largest and single most significant collection of Hopi Indian art lay buried amidst the dusty recesses of the Peabody Museum. The "Thomas V . Kearn Collection of Hopi Material Culture ," consisting of approximately 4,500 ethnographic objects ranging from prehistoric pots, baskets, and textile fragments to nineteenthcentury wooden tablitas and ceremonial art , was acquired thr...