The only protection is to keep the mass of U-235 below a certain "critical" size. Scientists had to calculate this sizethey could not experiment in a laboratory to find it out. The bomb had to be made in two parts. Each part would be below...英国华人论坛
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In mild flare ups, eczema is irritating at best and during severe flare ups, it can be both extremely itchy and painful. Complications can arise that are potentially life threatening, so care to prevent and lesson flare up is very important...英国华人论坛