MinutePhysics created a simple explanation of the complicated task of detecting secret nuclear tests. There's a push underway to demand that the US and other countries legalize such inspections worldwide. Read the rest
From preparing the bomb to dropping it—the explosion is a few seconds after 8:40. [Video Link]
This silent film shows the final preparation and loading of the "Fat Man" bomb into "Bockscar," the plane which dropped the bomb on Nagasaki. It then shows the Nagasaki explosion from the window of an observation plane. This footage comes from Los Alamos National Laboratory. I have not edited it in any way from what they gave me except to improve the contrast a little — it is basically "raw." I have annotated it with some notes on the bombing and what you can see — feel free to disable it if you don't want it.
A Q&A piece on the National Oceanic and Atmospheric Administration begins with this incredibly disconcerting sentence: "During each hurricane season, there always appear suggestions that one should simply use nuclear weapons to try and destroy the storms."
Really? Seriously, America?
Anyway, the entire piece ends up being pretty fascinating, as research meteorologist Chris Landsea explains why nuking a hurricane would be a bad idea ... besides, you know, the obvious reasons.
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... an explosive, even a nuclear explosive, produces a shock wave, or pulse of high pressure, that propagates away from the site of the explosion somewhat faster than the speed of sound. Such an event doesn't raise the barometric pressure after the shock has passed because barometric pressure in the atmosphere reflects the weight of the air above the ground. For normal atmospheric pressure, there are about ten metric tons (1000 kilograms per ton) of air bearing down on each square meter of surface. In the strongest hurricanes there are nine. To change a Category 5 hurricane into a Category 2 hurricane you would have to add about a half ton of air for each square meter inside the eye, or a total of a bit more than half a billion (500,000,000) tons for a 20 km radius eye. It's difficult to envision a practical way of moving that much air around.
Attacking weak tropical waves or depressions before they have a chance to grow into hurricanes isn't promising either. About 80 of these disturbances form every year in the Atlantic basin, but only about 5 become hurricanes in a typical year.