Many of the necessary tools, you probably already have in your tool chest. You may be working on a new roof, but it is more likely that you will be shingling a roof that already has a layer or two of shingles. If there is more than one layer you will need to remove the old shingles.
Electroencephalography definition, an instrument for measuring and recording the electric activity of the brain. See more.
An electroencephalogram (EEG) is a recording of brain activity. During the test, small sensors are attached to the scalp to pick up the electrical signals produced when brain cells send messages to each other.