Some other fun facts about the construction of the Mackinac Bridge. The annual Mackinac Bridge Walk is held every year on Labor Day. Two lanes of traffic are closed and 50-80,000 people, all led by the Governor of Michigan walk together over the bridge.
A lumbar puncture (also called a spinal tap) is a procedure to collect and look at the fluid (cerebrospinal fluid, or CSF) surrounding the brain and spinal cord. During a lumbar puncture, a needle is carefully inserted into the spinal canal low in the back (lumbar area). Samples of CSF are collected.
A lumbar puncture doesn't necessarily mean you have one of these conditions; it may be used to rule them out. A lumbar puncture can also be used to treat some conditions, such as injecting antibiotics or chemotherapy medication into the CSF. Read more about why lumbar punctures are used.