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There are several types of bullet proof vests that have been invented. For details, see the attached link.
The purpose of the metal racks is tohold stuff on that does not need to rotate, and the metal racks are smooth in order not to cause sparks, so unless your metal rack has been damaged it is generally safe to use.
No, there is no proof that cell phones cause tumors. Many alarmists began the rumor based on the microwaves in the cell phone but its has been proven a myth.
Gold was not invented- it is a natural metal found in the earth. It has been used as a medium of exchange (money) for over 6000 years.
Iron is naturally occurring. Nobody invented it. Nobody in particular discovered it either as it has been known since ancient times.
Metals are elements. nobody invented them. They have been around since the creation of the universe.
Microwave it. Microwaves are your friend.
The concept of a metal reactivity series was not invented by a single individual. It is a scientific idea that has been developed over time through the work of many scientists, researchers, and chemists who have studied the reactivity of metals.
There is currently no scientific evidence or widely accepted proof that time travel has been invented. The concept of time travel remains theoretical and is still a subject of scientific research and speculation.
In Chemistry it is possible to galvinise a nail using a power supply and a metal which is higher up in the electrochemical series. this must be done using an electrolight solution. The metal coating now rusts before the metal which has been galvinised. There may be various sprays which you can buy. Another way to make something rust proof is to paint it. This cuts of the oxygen and any water getting to the metal. I hope this helps Orkem
Nickel, as an element, has been known since ancient times. However, it was not discovered as a distinct metal until the 18th century. Axel Fredrik Cronstedt, a Swedish chemist, first isolated nickel as a pure metal in 1751.
A page proof is a trial page or proof which has been made up into pages.