Science
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To determine whether the body fluid shift from the lower limbs toward the head that occurs during spaceflight leads to lasting increases of venous pressure in the upper body, venous pressure and hematocrit measurements were made on four astronauts before flight and 1 and 12 hours after recovery and compared with measurements in space. During the mission the hematocrit was elevated and the venous pressure lowered by 1 to 8 centimeters of water as compared with the preflight data. ⋯ The fluid shift apparently takes place during the first several hours of spaceflight. Thereafter, the pressure in the peripheral veins and the central circulation is lower than that measured before flight.
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Inaccurate stratigraphic correlations in the Hell Creek area, Montana, have led to the assumption that transitional vertebrate faunas (Bug Creek Anthills) exist in the latest Cretaceous, refuting a catastrophic turnover at the Cretaceous-Tertiary boundary. Establishment of the transitional faunas in Paleocene channels that cut down through the Cretaceous-Tertiary boundary renders the terrestrial faunal record compatible with the marine record and with catastrophic extinction.
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The Supreme Court may soon be asked to decide an important issue of First Amendment law arising from the government's efforts to restrict the dissemination of "militarily critical" technological knowledge. To resolve the issue, the Court will first determine whether technological knowledge qualifies for a full measure of protection under the free-speech clause of the First Amendment. The Court will then address the government's stated justification for restricting the contested information. This inquiry will evaluate both the gravity of the asserted danger to national security and the likelihood of its occurrence.