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The Scientific Method is a method made by science
Do you mean legal to be taught in schools? Evolution has been the accepted theory as to the origin of 'complex' life for around 150 years. I'm not sure when it became legal to be taught in schools. Probably around the same time the scientific community accepted it.
aboujt 199 years
The scientific time scale is also called the Geologic time scale. It has been created to describe the order of major events on Earth for the last 4.5 billion years.
There is no simple answer to that question. Electricity, in the scientific sense, has been around for as long as we know. It was chronicled in Europe over 4000 years ago. Down through the centuries the study of electricity has been carried on by people all over the world, especially in that last 400 years. Amongst these are many European scientists and inventors.