Johnny Galecki only acted in NBC shows.
Sentinel is a former settlement in Fresno County , California .. California. California. Fresno County. Fresno County, California. It was located 2.5 mi west of Humphreys Station , at an elevation of 843 feet -LRB- 257 m -RRB- .. Humphreys Station. Humphreys Station, California. It still appeared on maps as of 1924 .. A post office operated at Sentinel from 1880 to 1883 , from 1888 to 1897 , and from 1905 to 1910 .