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...question that has health officials from Geneva to Washington puzzled. In Mexico, swine flu has caused severe respiratory disease in a number of patients - and even more worryingly, has killed the sort of young and healthy people who can normally shrug off the flu. (Fueling such concerns is the fact that similar age groups died in unusually high numbers during the 1918 pandemic.) Yet the cases in the U.S. have all been mild and likely wouldn't have even garnered much attention if doctors hadn't begun actively looking for swine flu in recent days. "What we're seeing...
...Some of the difference may be due to the fact that Mexico has apparently been grappling with swine flu for weeks longer than the U.S. As doctors across the U.S. begin checking patients with respiratory symptoms for swine flu, CDC officials expect to see more severe cases in the U.S. as well - and as better epidemiological work is done in Mexico, we'll probably hear about more mild cases there too. Right now, however, the true severity of the H1N1 swine flu virus is still an open question, whose answer could change over time. The 1918 Spanish flu pandemic began...
...emeritus professor of virology at Britain's University of Aberdeen. Pennington points out that conventional wisdom in 1976 held that the 1918 flu pandemic - which started among soldiers and eventually killed as many as 40 million - was the result of swine flu (scientists now know it was in fact a strain of bird flu). Despite modern advances in microbiology, today's health officials still make decisions in a "cloud of uncertainty," Pennington says. "At the moment, our understanding of the current outbreak is similarly limited. For example, we don't yet understand why people are dying in Mexico...
When a scientific principle is common knowledge even in grammar school, you know it has long since crossed the line from theory to established fact. That's the case with dinosaur extinction. Some 65 million years ago - as we've all come to know - an asteroid struck the earth, sending up a cloud that blocked the sun and cooled the planet. That, in turn, wiped out the dinosaurs and made way for the rise of mammals. The suddenness with which so many species vanished after that time always suggested a single cataclysmic event, and the 1978 discovery...
...That doesn't mean we should expect Asian nations to immediately start shooting wars over access to the Mekong or the Yalu - though all bets are off if climate change leads to the loss of the Himalayan glaciers whose seasonal melt provides water for billions in Asia. In fact, the history of cross-border water disputes has been surprisingly conciliatory so far. India and Pakistan have fought three wars and currently point nuclear weapons at each other, yet the Indus Waters Treaty - which divvies up the two countries' trans-boundary waterways, overseen by a joint commission - has survived for decades...