Word: systemic
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...urged a more modest bill in the short term. It's clear, however, that if the nation has any real interest in reducing driving, unclogging our roads and cutting back on the carbon emissions that come from transportation, we need to get serious about overhauling our antiquated public-transit system - and that will cost billions. "Failing to fix this will be unacceptable," says Goldberg...
...water is the elixir of life, it's no wonder that Earth - which is 70% ocean - simply teems with living things. The other planets and moons in the solar system don't have it so good. They're forbidding places that are hydrological deserts, and thus biological ones...
That, at least, had long been the conventional wisdom, but in recent years, scientists have come to learn that by some measures, the solar system fairly sloshes with water. Mars, we now know, was once as wet as Earth and still harbors ice and perhaps liquid water. The moon is thought to have water locked in permafrost at its poles. Jupiter's moon Europa is probably home to a globe-girdling ocean beneath a thin rind of ice, and its Jovian sisters Callisto and Ganymede appear to be icy and wet too. Now, according to new findings by the Cassini...
...Cassini probe, which was launched from Earth in 1997 and arrived at Saturn in 2004, had a big job to do: principally, studying the planet's elaborate ring system and taking a census of its litter of moons - of which 53 have been found and named. Of those, Enceladus, discovered in 1789, held some of the deepest secrets. (See pictures of Saturn...
...white, almost as if covered in ice or snow; when the Voyager 1 spacecraft arrived at Saturn in 1981, it confirmed that long-distance impression. More intriguing was the way Enceladus behaved. Embedded inside Saturn's E ring - the outermost of the eight bands that make up the ring system - Enceladus seemed to orbit with a thick clump of ring matter trailing behind it, almost as if it were dragging the material in its gravitational wake. What astronomers suspected instead - and what Voyager confirmed - was that Enceladus was not dragging matter but expelling it, chugging through its orbits like...