lisa flores. lisa, tu palabra también es 'sipc'. ¿podría tenerla en otra oración, por favor?vided by... [ horn honks ] narrator: air pollution -- we can't always see it, but its effects can be deadly. to find ways to reduce its impact, we need to know exactly what pollutants are emitted and how they change as they travel through the atmosphere. at this point, we primarily have sulfate particles. using cutting-edge instruments, aerodyne research can detect tiny concentrations of pollutants in real time, tracking them back to their sources and showing how they evolve hour by hour under the effects of sunlight and weather. in mexico city, luisa molina is leading a group of over 450 scientists in the most comprehensive study ever conducted of one city's air emissions. sampling its plume of pollutants from cradle to grave, the team hopes to learn how the city's pollution affects the surrounding regions and even the global climate. today, the rapid increase of population and industrialization is causing increasing concerns about air pollution. both researchers hope to discover what

lisa flores. lisa, tu palabra también es 'sipc'. ¿podría tenerla en otra oración, por favor?g. funding for this program is provided by annenberg/cpb, to advance excellent teaching. poussaint: the term "interest group" tends to have a negative meaning, and some interest groups do present problems for a democracy. but there's a positive side as well. large and small, rich and poor, tightly or loosely organized, interest groups bring pressure on public officials to promote particular policy agendas, which actually enhances democracy by linking citizens directly to their representatives. i'm renee poussaint. most long-lasting interest groups in our society focus on advancing the economic well-being of their members. because their members have an economic incentive, they are likely to be well-funded professional organizations which can employ lobbyists, mount well-orchestrated demonstrations, and conduct massive writing, e-mail, and telephone campaigns -- all designed to bring their concerns to the attention of decision makers. this is crusader, built by united defense. it was an

lisa flores. lisa, tu palabra también es 'sipc'. ¿podría tenerla en otra oración, por favor?c.org. funding for this program is provided by annenberg/cpb, to advance excellent teaching. now, you cannot tell me that the day i was born, it was said i could never run for president because i wouldn't meet my oath of office! woman: vote for our neighbor, cynthia rubenstein, for county council. can you see the red against red? it's time to vote. you have the right to vote. if you're 18 or older and an american citizen, register to vote. you tell them what to do. vote! elections, from city council to president of the united states, we elect men and women to represent us at every level and in every branch of government. the people we choose make critical policy decisions, craft our laws, and judge us in many of our courts. considering that elected officials determine so much about the lives we lead, on what basis do we -- or should we -- choose and support a candidate? i'm renee poussaint. our elected representatives are just that, elected. in order to win, a candidate must campaign t

lisa flores. lisa, tu palabra también es 'sipc'. ¿podría tenerla en otra oración, por favor?g. usted tiene el derecho de permanecer callado. usted tiene el derecho de ser escuchado. cualquier cosa que usted diga... lo que usted diga será escuchado con dignidad y respeto. usted tiene derecho a información y asistencia. sin justicia para las víctimas de crimen, no hay justicia. >> the 16th-century metaphysical poet john donne said, "no man is an island, entire of itself." in fact, as social beings, we are connected. but beyond that...virtually everything we experience -- in nature as well as human activity -- involves a series of connections that link one thing to another. networks, you might say, make the world go round. [ indistinct chattering ] meet raymond price: media tycoon, power broker, and center of attention. this is his party, his network. enter joe smith. he's just crashed the social event of the year and apparently doesn't know a soul. but this is one network joe would like to join. now, if he could only get connected. >> nice party. >> mr. price knows how to enter

lisa flores. lisa, tu palabra también es 'sipc'. ¿podría tenerla en otra oración, por favor?ng a vision of the world around us. [ thunder rumbling ] sound waves crashing against our ears, sometimes jarring and other times beautiful. cosmic waves bathing the universe. all of it explained, illuminated, and connected via mathematics. sometimes we call it harmonic analysis, other times we call it spectral analysis, but most people call it fourier analysis. of all these sensory experiences, perhaps music more than any other is the one that is most closely associated with mathematics. the greeks believed that beautiful music was mathematically based music and that there was a mystical connection between music and mathematics, that music was actually the mathematics of time. throughout history, music has been at the heart of human culture. its origins were most likely the patterns, rhythms, and tonalities of nature, sounds adapted and organized by humans to create melody, harmony, and rhythm. some of the earliest instruments were as simple as clapping hands. but it was the ancient g

lisa flores. lisa, tu palabra también es 'sipc'. ¿podría tenerla en otra oración, por favor?os de sipc están disponibles para satisfacer las reclamaciones de los clientes de firmas de corretaje hasta un máximo de $500,000, incluyendo hasta $100,000 por rec 'sipc', eftivo s-i-p-k. ¿no conoce a sipc - securities investor protection corporation? no importa. se lo deletrearemos. visite nos www.sipc.org.

lisa flores. lisa, tu palabra también es 'sipc'. ¿podría tenerla en otra oración, por favor?