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.
The Federal law was amended in 1986 to begin Daylight Saving Time on the first Sunday in April. Under legislation enacted in 1986, Daylight Saving Time in the U.S. began at 2:00 a.m. on the first Sunday of April and ended at 2:00 a.m. on the last Sunday of October.