At about 63,000 feet, the low air pressure would cause blood at normal body temperature to do what?

At about 25,000 feet down, the Cayman Trench is the deepest part of which sea? Which Nepalese peak, at about 29,000 feet, is the highest mountain on Earth above sea level? At about 43,000 square miles, which is the largest independent island nation in the Western Hemisphere? Red Lake, at about 440 square miles, is the largest natural lake entirely within which "Land of 10,000 Lakes" state? Which very large brown bear shares its name with an Alaskan island? At over 7,000 feet, which Western Hemisphere city is the highest ever to host the Summer Olympics? At age 10 in 2000, who became the youngest player at the time to qualify for a USGA amateur championship? In the 1971-72 season, which future NHL star scored 378 goals for the Brantford Nadrofsky Steelers youth team?