Well, technically, this is false. The Test Ban Treaty of 1963 prohibited nuclear weapons testing in the atmosphere, in outer space, and under water, but it didn't ban testing underground. However, it does prohibit nuclear explosions underground if they cause "radioactive debris" and contaminate the living surroundings.
The answer to 10-(-12)/4 x 3 = 19
Answer: Cowry shells are believed to have been the earliest form of currency used in Central China, and were used during the Neolithic period. Around 210 BC, the first emperor of China Qin Shi Huang (260–210 BC) abolished all other forms of local currency and introduced a uniform copper coin.
(I used google translate but I hope this helps) A medida que el agua fluía hacia las ciudades, se usaba para beber, irrigar y para suministrar cientos de fuentes y baños públicos.
