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"In the first century of flight, NASA made countless contributions to aviation by improving performance, efficiency and safety. Just as we needed the brightest minds for all those contributions, we need the brightest minds now and in the future to develop, operate and improve our future air transportation system,"

Teams of three to seven high school students from at least 29 states and the District of Columbia will compete to design a more fuel-efficient airplane

The technology used to bring slum-dwellers like Das their first bank accounts is so advanced that it isn't available to even the most tech-savvy Americans

But today, some emerging economies are starting to leapfrog ahead. Why build a network of telephone wires out to remote areas when you can go straight to a cutting-edge mobile network at a fraction of the cost? Why burn fossil fuels for electricity and cooking if cleaner - and in some cases cheaper - alternatives, like solar and biogas, are available? Why electrify rural villages with incandescent bulbs if longer-lasting, environmentally friendly options like LEDs or new fluorescent bulbs exist? In many cases, it is mature markets like the United States and Europe, tethered to older systems, that find themselves playing catch-up.