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2. Fluorescent lamps and health - Wikipedia

   en.wikipedia.org/wiki/Fluorescent_lamps_and_health

   An open (single envelope) CFL [12] An encapsulated/closed (double envelope) CFL. Some fluorescent lamps emit ultraviolet radiation. [citation needed] The Health Protection Agency of the United Kingdom has conducted research concluding that exposure to open (single envelope) compact fluorescent lamps (CFLs) for over 1 hour per day at a distance of less than 30 cm can exceed guideline levels as ...

3. Home automation - Wikipedia

   en.wikipedia.org/wiki/Home_automation

   Early home automation began with labor-saving machines. Self-contained electric or gas powered home appliances became viable in the 1900s with the introduction of electric power distribution [3] and led to the introduction of washing machines (1904), water heaters (1889), refrigerators (1913), sewing machines, dishwashers, and clothes dryers.

4. Seven-segment display - Wikipedia

   en.wikipedia.org/wiki/Seven-segment_display

   For gasoline price totems and other large signs, electromechanical seven-segment displays made up of electromagnetically flipped light-reflecting segments are still commonly used. A precursor to the 7-segment display in the 1950s through the 1970s was the cold-cathode, neon-lamp-like nixie tube .

5. 7 Ways To Humidify A Room Without A Humidifier, According To ...

   www.aol.com/lifestyle/7-ways-humidify-room...

   The 50 best Christmas gifts for everyone on your list this year

6. 4 brain games to keep your mind sharp and improve memory ...

   www.aol.com/lifestyle/4-brain-games-keep-mind...

   According to Harvard Health, “crossword puzzle clues often force you to link concepts you hadn't pictured together. These features mean that crossword puzzles cause large areas of your cortex to ...

7. LED circuit - Wikipedia

   en.wikipedia.org/wiki/LED_circuit

   In CC drivers, the voltage changes while the current stays the same. CC drivers are used when the electrical load of the LED circuit is either unknown or fluctuates, for example, a lighting circuit where a variable number of LED lamp fixtures may be installed. As an LED heats up, its voltage drop decreases (band gap decrease [1]). This can ...