noun. 1  The definition of a brain is the mass of nerve tissue located in the head of animals with spinal cords; it is the center of thought and controls movement. An example of brain is what is damaged when someone has Alzheimer's disease. 2  A brain is defined as a smart or intellectual person.
But there is something you can do to pass the retest: Drive your car. In January, Illinois initiated a new emissions test for cars from the 1996 model year and newer. Forget the dynamometer (treadmill) exhaust emissions test. The new test involves checking your gas cap, looking at the check-engine light and plugging a device into your car's diagnostic link.
The largest human source of nitrous oxide emissions is from agriculture which accounts for 67%. Agriculture creates both direct and indirect emissions. Direct emissions come from fertilized agricultural soils and livestock manure (42%). While indirect emissions come from runoff and leaching of fertilizers (25%).