General Pharmacology. Beta-blockers are drugs that bind to beta-adrenoceptors and thereby block the binding of norepinephrine and epinephrine to these receptors. This inhibits normal sympathetic effects that act through these receptors. Therefore, beta-blockers are sympatholytic drugs.
Don't know much about the origins of daylight saving time? Maybe it's time to learn about the semi-annual time shift, which goes into effect on Sunday across most of the U.S. and in 69 other countries around the world. Benjamin Franklin is sometimes credited with the invention of daylight saving time.
March 19, 1918 - The Standard Time Act establishes time zones and daylight savings. Daylight savings is repealed in 1919, but continues to be recognized in certain areas of the United States. 1945-1966 - There is no federal law regarding Daylight Saving Time.