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Who invented bullet proof vests?
There are several types of bullet proof vests that have been invented. For details, see the attached link.
What is the purpose of the metal rack that comes in some microwaves and is it safe to use the microwave with it in place?
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.
Can your cell phone really cause brain tumors?
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.
When was iron and metal invented?
Iron is naturally occurring. Nobody invented it. Nobody in particular discovered it either as it has been known since ancient times.
What year was gold invented?
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.
What metal did the Chinese invent?
Metals are elements. nobody invented them. They have been around since the creation of the universe.
How do you cook a potato after it has already been cooked?
Microwave it. Microwaves are your friend.
What chemical makes a nail rust-proof?
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
When was nickel invented?
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.
What is a page proof?
A page proof is a trial page or proof which has been made up into pages.
How did forks come into common usage?
It is believed to have been invented during the Roman Empire or Ancient Greece but there is no definite proof of where or when. It's all speculation, but their usefulness is pretty obvious.
What is the value of a twenty dollar Australian coin?
Such a coin would have been issued as part of a mint or proof set. Any value would depend on the metal it was struck from and the design of the coin.
