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Why everyone was wrong The coronavirus is slowly retreating. What actually happened in the past few weeks? The experts have missed basic connections. The immune response against the virus is much stronger than we thought. By Beda M Stadler This is not an accusation, but a ruthless taking stock [of the current situation]. I could slap myself, because I looked at Sars-CoV2- way too long with panic. I am also somewhat annoyed with many of my immunology colleagues who so far have left the discussion about Covid-19 to virologist and epidemiologist. I feel it is time to criticise some of the main and completely wrong public statements about this virus. Firstly, it was wrong to claim that this virus was novel. Secondly, It was even more wrong to claim that the population would not already have some immunity against this virus. Thirdly, it was the crowning of stupidity to claim that someone could have Covid-19 without any symptoms at all or even to pass the disease along without showing any sy

he Blast Wave A fraction of a second after a nuclear explosion, the heat from the fireball causes a high-pressure wave to develop and move outward producing the blast effect. The front of the blast wave, i.e., the shock front, travels rapidly away from the fireball, a moving wall of highly compressed air. The effects of the blast wave on a typical wood framed house. The air immediately behind the shock front is accelerated to high velocities and creates a powerful wind. These winds in turn create dynamic pressure against the objects facing the blast. Shock waves cause a virtually instantaneous jump in pressure at the shock front. The combination of the pressure jump (called the overpressure) and the dynamic pressure causes blast damage. Both the overpressure and the dynamic pressure reach to their maximum values upon the arrival of the shock wave. They then decay over a period ranging from a few tenths of a second to several seconds, depending on the blast's strength and

Effects of Radiation on the Human Body Click on a number to learn about the effects of radiation on the body (1) Hair The losing of hair quickly and in clumps occurs with radiation exposure at 200 rems or higher. (2) Brain Since brain cells do not reproduce, they won't be damaged directly unless the exposure is 5,000 rems or greater. Like the heart, radiation kills nerve cells and small blood vessels, and can cause seizures and immediate death. (3) Thyroid The certain body parts are more specifically affected by exposure to different types of radiation sources. The thyroid gland is susceptible to radioactive iodine. In sufficient amounts, radioactive iodine can destroy all or part of the thyroid. By taking potassium iodide, one can reduce the effects of exposure. (4) Blood System When a person is exposed to around 100 rems, the blood's lymphocyte cell count will be reduced, leaving the victim more susceptible to infection. This is often refered to as mild

The number of nuclear weapons in the world has declined significantly since the Cold War: down from a peak of approximately 70,300 in 1986 to an estimated 14,900 in early-2017. Government officials often portray that accomplishment as a result of current arms control agreements, but the overwhelming portion of the reduction happened in the 1990s. Moreover, comparing today’s inventory with that of the 1950s is like comparing apples and oranges; today’s forces are vastly more capable. The pace of reduction has slowed significantly. Instead of planning for nuclear disarmament, the nuclear-armed states appear to plan to retain large arsenals for the indefinite future. Click on graph to view full size Despite progress in reducing Cold War nuclear arsenals, the world’s combined inventory of nuclear warheads remains at a very high level: approximately 14,930 warheads as of mid-2017. Of these, roughly 9,400 are in the military stockpiles (the rest are awaiting dismantlement), of which more