13 10 cents of silver coins, 13 1 cents of copper coins, and 13 pins, plus a cup of salt water, what can you do? Answer: Be able to make a 1.5 volt battery! See the picture below. Pour the salt water into each small grid about 3/4 full (as shown in the above figure, you can directly use the ice box that is common in the refrigerator), connect the two coins one by one and then use the pins, then follow the above picture one by one. Organize well (note the order of copper and silver coins). Finally put the LED small light, it will shine! Note: In fact, the above mentioned 2001 should be before 1983, because almost all Pennies were pure copper or bronze before 1983, so the conductivity is very good, and after 1983 the policy changed all Pennies. Both are galvanized and have poor electrical conductivity. However, I think the effect should be the same when replaced with copper. Friends who like to survive in the wild, can you refer to it, in case of need! best e cig,e cig vaporizer,best e cig vape,e cigaratte,vape cigratte Newmax Electronics Co.,Limited , https://www.advvape.com