What are the pros and cons of between Zigbee and Z-Wave communication protocols used in IoT device space?
Would not a telephone call (from the late 1950s) auto-disconnect if one of the parties "closes the handle"?
Will the water in a gold fish bowl signficantly abosorb Bluetooth or WiFi if transciever is at bottom of bowl?
Why radio communication was limited to military use and did not become popular with general public like cell phones have become today?
Why only the spectrum range of radio waves can be reflected from atmospheric layers while higher ranges (Infrared-Visible Light-Ultraviolet) can't?
How is it possible that an *undertaker* invented the automatic telephone exchange? And as early as in 1888?
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