Leo Geier introduces the viewers to Euterpe, the Greek muse of music and then introduces William Sebastian Hart, faculty member at the Peabody Conservatory and founder/musical director of the Gettysburg Symphony Orchestra. Dr. Hart states that the three artistic entities of music are the composer, the orchestra, and the conductor. The composer invents the music, which is made up of rhythm, melody, and harmony. He demonstrates each of these elements with the tune "Pop Goes the Weasel," which he also plays in the styles of Mozart, Bach, Mendelssohn, Debussy, and Prokofiev. Baltimore composer Sidney Shapiro wrote these variations for this broadcast. Next Dr. Hart describes the history of the orchestra and how instruments were added. He shows a chart of the orchestra seating for a 90-member symphony and explains how the sounds are balanced. Lastly, Dr. Hart explains how the conductor and his baton evolved from the church's choirmaster keeping time with his staff. He displays one page of a full orchestra score and explains each line written for different instruments. The conductor has many tasks, including controlling the orchestra's balance and timing, setting the pace, and unifying the whole, but most of all he must inspire the musicians.

As historical background to 1959 Doppler radar navigation systems, an animated film considers the use of Ptolemy and Mercator's maps, the magnetic compass, and John Hadley's 1731 sextant. Clarence Rice, aviation products manager of the Bendix Radio Division in Baltimore, MD, points out that aviation navigation depends on knowing the ground speed and the path of the aircraft over the earth. He uses a chart to demonstrate the effects of winds on plane direction and the efforts to compensate: a homing device, which did not account for wind drift and also picked up static interference; the radio range system, which used four beams to overcome the drift problem but still received static; and the manual direction finder, which became the standard aid in the 1930s. A film describes how, in 1939, Bendix developed the automatic direction finder (ADF) with omnirange, which also eliminated static. Over the ocean, LORAN, or long range navigation, devices were used. Another animated film shows how Christian Doppler, in 1842, described the Doppler effect based on sound waves and how that principle has been applied to radar's radio waves. The film explains the "plus" Doppler effect for direct measurement of forward speeds and the "minus" for measurement of drift angle. Pitch and roll are also corrected by the radar beams since beam compensation is based on the magnitude of the Doppler shift. A plane's Doppler radar components include a transmitter, antennae, receiver, frequency tracker, and cockpit indicator. Mr. Rice explains how pilots divide their flights into shorter legs, placing the information into the navigational computer. He notes that Doppler radar will not become obsolete with faster aircraft speeds and that it does not require a land-based facility.

In this final program of a three-part series, Robert Neathery, Director of the Science Museum of Philadelphia's Franklin Institute, discusses the possibility of life on Mars by first defining the needs of life as we know it: water, oxygen, food, moderate temperatures, adaptation to gravitational forces, and protection from radiation. He then gives the history of Mars from Francesco Fontana's 1636 drawing of the planet to Christian Huygens' comments on possible inhabitants of Mars and Giovanni Schiaparelli's 1877 observation of Mars's channels (mistakenly translated as "canals" by others). Mr. Neathery describes a diagram of the planet's orbit between 1956-71 indicating its nearness to the earth every 15 years. Aerology, or the study of the features of Mars, is done with telescope, spectroscope, thermocouple, and camera and reveals polar caps that wax and wane and a reddish color, thought to be desert, covering 75% of the planet's surface. Dr. Neathery shows a cactus in a bell jar containing nitrogen, argon, carbon dioxide, and oxygen in proportions considered similar to those in the Martian atmosphere and compares it to a cactus plant outside the jar. He also uses balloons filled with nitrogen or helium to demonstrate the escape velocity of gravity on earth as compared to the lower surface gravity on Mars. Because oxygen is nearly non-existent on Mars, the temperatures are extreme, and it's unclear whether chlorophyll exists on the planet, Dr. Neathery concludes that Mars is inhospitable to life as we know it. However, he is certain that man's curiosity will take him there. The trip will take eight months, and an artist's rendition shows what will be seen upon landing. Dr. Neathery laments that the public's belief in Orson Welles's 1938 "War of the Worlds" radio broadcast is a sad commentary on their understanding of science.

On this Easter Sunday program, Lynn Poole and art professor Adolf Katzenellenbogen discuss Christ's resurrection and its depiction in early art. Dr. Katzenellenbogen notes that the event is generally presented in three ways: symbolically, indirectly, and directly. He and Mr. Poole analyze the elements of a symbolic stone relief. The indirect depiction shows the three holy women visiting the spice merchant and/or the sepulcher. Actors perform a typical Easter drama of this event, and Dr. Katzenellenbogen compares a painting, fresco, and woodcut of the similar scene. Christ rising from the tomb is the direct portrayal of the resurrection. Dr. Katzenellenbogen discusses a series of paintings, by artists Piero della Francesca, Giovanni Bellini, and Matthias Grunewald, in historical sequence, indicating how the landscape in the scenes becomes progressively more real and the light and darkness more contrasted. Paul Hindeman's Grunewald-inspired music closes the program.

Lynn Poole summarizes some of the fourteen areas of activities taking place during the International Geophysical Year (IGY), 7/1/57 - 12/30/58: aurora and airglow, cosmic rays, geomagnetism, meteorology, solar activity, glaciography, gravity, ionospherics, longitude and latitude, oceanography, rocketry, satellites, seismology, and world days. IGY was timed to coincide with the high point of the eleven-year cycle of sunspot activity. A few of the highlights include Dr. William Markowitz's Moon Camera for measuring precise time, the use of the sea gravimeter to record changes in the earth's gravity, Dr. Harry Wexler's U.S. expedition to Antarctica to study atmospheric circulation and other meteorological phenomena, a recording of "whistlers" or low frequency radio signals caused by lightning flashes, John Simpson's study of primary and secondary cosmic rays, the use of the Baker-Nunn satellite tracking camera, and Dr. James Van Allen's Explorer I orbiting satellite.

Dr. George Carter, geology professor at Johns Hopkins University, shows a "talking board" discovered in 1868 on Easter Island and discusses previous attempts to decipher its symbols, called rongorongo, as writing or decoration. A film clip of Byrd's expedition party visiting the stone statues on Easter Island sets the scene. Bishop Tepano Jaussen of Tahiti was the first person to investigate this mystery, and he ultimately published a dictionary of identified glyphs in 1898. He was followed by Thomas Crafts, who concluded that the symbols were just decorations; William J. Thomson, who attempted unsuccessfully to have a story board translated; Bishop Claessens, who reported that figures on an island in the Seychelles were similar to the rongorongo; Lacouperie, who discovered seals in south India similar to the Easter Island symbols; and, William Hevesy, who pointed out the similarities of seals excavated in the Indus Valley to forms on Easter Island.

Lynn Poole describes the two formative revolutions during John Locke's lifetime (1632-1704): the Puritan Revolution and the Glorious Revolution. Costumed actors examine Locke's ideas on government that led to his 1690 publication of "Two Treatises of Government," on natural rights theory and the social contract. Locke argued that all governments are a contract between the governing and governed and that the government rests on the consent of the governed. Lynn Poole reads from Locke's "A Letter Concerning Toleration," a religious tract. Subsequent acted scenes show Locke's later influence: a 1750 rationalist claims the most influential works are the Bible and Locke's publishings, such as "Some Thoughts Concerning Education," and "An Essay Concerning Human Understanding;" a 1776 American patriot demonstrates how Locke's political ideas are reflected in the Declaration of Independence; and a 1789 Frenchman explains how Locke's concepts were expanded by Voltaire.

This program, first in a series of six about men who changed the world, shows the impact of Sigmund Freud's ideas on our lives. Lynn Poole briefly discusses Freud's early work with Joseph Breuer, who used hypnosis to treat patients with hysteria. This led to Freud's version of psychoanalysis. He believed that the human personality was composed of the conscious and unconscious mind and that impressions in childhood, predominantly sexual, which the conscious mind refused to accept became neuroses in the unconscious mind. Freud's publications affected all disciplines, as evidenced in the reading of a stream of consciousness passage from James Joyce's "Ulysses." The impact was similar in art works such as Salvador Dali's "Persistence of Memory" and Yves Tanguy's "Mama, Papa is Wounded!" Freud's influence on poetry is proven by comparing love poetry written by William Wordsworth in 1804 with that of W. H. Auden written in 1958. Freud's mark on child rearing is apparent when compared to recent works on the subject.

Nicolaus Copernicus took issue with early astronomers such as Ptolemy, who wrote the "Almgest," a catalog of the motions of the planets and position of stars based on his use of an astrolabe. Costumed actors portraying Copernicus and his pupil Rheticus discuss astronomical theories and question the prevailing belief in the epicycles of planets in an earth-centered universe. However, their work was criticized by the church, including Martin Luther who considered the concept of the earth revolving and rotating to be "ludicrous." Danish astronomer Tyco Brahe combined the best findings from both Ptolemy and Copernicus, but did not accept the latter's heliocentric universe. Rheticus, however, wrote about that theory in his "First Account." Copernicus died in 1543, as his "Concerning the Revolution" was being published. Giordano Bruno defended the Copernican heliocentric theory and was tried as a heretic and burned at the stake.

Lynn Poole describes how Charles Darwin changed the world with his theory of evolution--that all forms of life evolved from lower forms through natural selection. Poole briefly describes Darwin's life, tracing on a map the naturalist's five-year (1831-36) journey on the "H.M.S. Beagle," on which he observed the variations of species on the Galapagos Islands and their modifications to their environments. Darwin concluded that successful characteristics are transmitted by the fittest survivors of a species and that the process of evolution continuously creates change. His ideas were published in 1859 in "Origin of Species," with the support of Joseph Hooker, Charles Lyell, Alfred Russel Wallace, and Thomas Huxley. Responses and challenges to these heretical views were made by such critics as Samuel Wilberforce, Lord Kelvin, and Fleeming Jenkin.