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 test used to evaluate the electrical activity in the brain. Brain cells communicate with each other through electrical impulses, and an EEG can be used to help detect problems associated with this activity.