Mercury Seven summon the last group. The tests included spending hours on treadmills and tilt tables, submerging their feet in ice water, three doses of castor oil, and five enemas. Six candidates were rejected as too tall for the planned spacecraft. Another 33 failed or dropped out during the first phase of exams. Four more refused to take part in the second round of tests, which eliminated eight more candidates, leaving 18. From the 18, the first seven NASA astronauts were chosen, each a "superb physical specimen" with an IQ above 130, and the ability to function well both as part of
Seven Society that a more "beneficial organization" was needed. The only known method to successfully contact the Seven Society is to place a letter at the Thomas Jefferson statue inside the University's historic Rotunda (accounts differ on the exact placement of the letter, either on the base or in the crook of the statue's arm). The group contributes financially to the University, announcing donations with letters signed only with seven astronomical symbols in the order: Earth, Jupiter, Mercury, Mars, Neptune, Uranus, and Venus. The Society gives large monetary donations and scholarships to the University each year in quantities that include the number