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Heavily traveled international borders, like the one seen here between Mexicali, Mexico, (right) and Calexico, California, (left) can present acute public health concerns. To delete this file, click the file name with your mouse, then right-click and scroll down the menu to the "delete" option. To remove the photo permanently from the desktop, locate the photo on the hard drive and drag it to the trash. A pack of aucasaurs, predators of Argentina's Auca Mahuevo badlands, attacks a group of startled titanosaurs in this artist's depiction. Morning Coffee Physics is a science blog aimed at non-scientists to quench their thirst for amazing facts about the world that are sometimes overlooked or unknown by the general public. The picture to the right is a real piece of string that vibrated about ten or twenty times over a two second exposure. Japan suffered its worst earthquake in a decade in October 2004, when a magnitude 6.6 quake rattled Niigata Prefecture, killing dozens and displacing 100,000 people.

Guide to the most powerful forces on Earth: earthquakes, volcanoes, hurricanes, and tornadoes. Migrants from Mexico, where health care is often poor and vaccination rates low, can carry diseases that have been nearly eradicated in the United States. Scientists believe Aucasaurus probably attacked in packs, pushed past adult titanosaurs guarding nests, and picked off baby titanosaurs as they hatched. Cut by the Colorado River over millions of years, the Grand Canyon is considered one of the finest examples of arid-land erosion in the world. Scientists often can say where such extreme shaking is likely to hit—but still can't tell when. Wind turbines convert kinetic energy from wind into electrical, thermal, or mechanical energy with virtually no harm to the environment.
The digestive system helps break down complex meals into the constituent parts the body can use: carbohydrates, proteins, fats, vitamins, and minerals.

The immense canyon is 277 miles (446 kilometers) long and averages 4,000 feet (1,200 meters) deep, but it is only 15 miles (24 kilometers) across at its widest. With only minutes of sun exposure, skin cells stained with a fluorescent dye show signs of increasing DNA damage. The smallpox virus changed much of Mexican history when, in the early 1500s, Spanish conquistadors brought the disease to the New World. A subsequent epidemic wiped out much of the local population, bringing on the collapse of the Aztec Empire.

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