On April 4, 1972, the Pulsar was finally ready, made in 18-carat gold and sold for $2,100. It had a red light-emitting diode (LED) display. Digital LED watches were very expensive and out of reach to the common consumer until 1975, when Texas Instruments started to mass-produce LED watches inside a plastic case.
Dew point temperature is defined as the temperature to which the air would have to cool (at constant pressure and constant water vapor content) in order to reach saturation. A state of saturation exists when the air is holding the maximum amount of water vapor possible at the existing temperature and pressure.
Birds depend less on the senses of smell and taste than people do. Most birds have little use for the sense of smell. The odors of food, prey, enemies or mates quickly disperse in the wind. Birds possess olfactory glands, but they’re not well developed in most species, including the songbirds in our backyards.