1997    driving    dual carriageway    expressways    highway (type of fictional setting)    interstate highways    parkway    pennsylvania turnpike (road)    public broadcasting service (tv network)    road culture    roadgeek    roads    roadways    transportation    transportation planning (field of study)    us interstate highway system (highway system)   

1970s (event)    1973    1983    barbara jordan (u.s. congressperson)    bob halderman    documentary (tv genre)    impeachment (literature subject)    impeachment hearings    john dean (politician)    john ehrlichman    nixon white house tapes (literature subject)    politics (tv genre)    public broadcasting service (tv network)    richard nixon (us president)    scandal (quotation subject)    united states house of representatives (governmental body)    watergate hearings    watergate scandal (event)    weta-tv   

1970s (event)    1973    1983    barbara jordan (u.s. congressperson)    bob halderman    documentary (tv genre)    impeachment (literature subject)    impeachment hearings    john dean (politician)    john ehrlichman    nixon white house tapes (literature subject)    politics (tv genre)    public broadcasting service (tv network)    richard nixon (us president)    scandal (quotation subject)    united states house of representatives (governmental body)    watergate hearings    watergate scandal (event)    weta-tv   

age of the universe    alien top secret    astonishing discoveries    astronomers    birthplace of stars and planets    black holes    cosmic expansion    cosmos    dark energy    edge of science    galaxies    heroic astronauts    history of astronomy    hubble    hubble space telescope    hubble space telescope (satellite)    invisible universe revealed    milky way    milky way (galaxy)    nasa    public broadcasting service (tv network)    scientists and engineers    space exploration    space flights    space telescope