41. Not all scientists accept Hekimi's assertion that his findings reveal the existence of a master clock that controls life span. 42. Slave clock synchronization is usually achieved by phase-locking the slave clock signal to a signal received from the master clock . 43. Many drum machines which have DIN sync and MIDI clock outputs can act as master clock for those two formats. 44. Q : Can you print the telephone number for the naval master clock observatory, if that is the proper name? 45. A : For absolute accuracy, call 202-762-1401 for the time from the U . S . Naval Observatory's master clock . 46. Slave clocks rely upon electrical impulses from the master clock to mechanically move the clock hands one unit of time. 47. How can I set my computer's clock to the time indicated by the U . S . Naval Observatory master clock ? 48. Moreover, hemoglobin carries nitric oxide, a neurotransmitter that could carry information about day length to the master clock in the brain. 49. A : It will be done at the U . S . Naval Observatory in Washington, which houses the Master Clock . 50. The U . S . Naval Observatory uses about 70 of them along with other instruments for the nation's Master Clock .
