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.
Causes. Cerebral palsy is caused by an abnormality or disruption in brain development, usually before a child is born. In many cases, the exact trigger of this abnormality isn't known.Factors that may lead to problems with brain development include: 1  Random mutations in genes that control brain development.auses. Cerebral palsy is caused by an abnormality or disruption in brain development, usually before a child is born. In many cases, the exact trigger of this abnormality isn't known.