The Progressive Era. During the period known as the Progressive Era (1890s to about 1920) the U.S. government became increasingly activist in both domestic and foreign policy.
One possible link between brain freeze and other headaches is local changes in brain blood flow. If further research confirms all these types of headaches are caused by blood flow changes, new drugs that block widening of the blood vessels - called vasodilation - could improve treatment for sufferers.
Our memory starts to fail, especially the short-term form of memory ability that is so crucial for learning new things. Brain-scan technology reveals aging can cause the brain to shrink. Nerve tracts in the brain shrivel, making the cerebrospinal fluid cavities larger and even leaving gaping holes in the brain.