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2. Twinspot - Wikipedia

   en.wikipedia.org/wiki/Twinspot

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

3. Passive infrared sensor - Wikipedia

   en.wikipedia.org/wiki/Passive_infrared_sensor

   A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors . PIR sensors are commonly used in security alarms and automatic lighting applications.

4. Hypargos (bird) - Wikipedia

   en.wikipedia.org/wiki/Hypargos_(bird)

   The genus Hypargos was introduced in 1862 by the German naturalist Ludwig Reichenbach to accommodate the pink-throated twinspot. [1] [2] The name combines the Ancient Greek hypo meaning "beneath" with Argos from Argus Panoptes, the many-eyed giant in Greek mythology. [3]

5. Green-backed twinspot - Wikipedia

   en.wikipedia.org/wiki/Green-backed_twinspot

   Green-backed twinspot in Budongo Forest, Uganda. The green backed twinspot prefers its privacy in regards to breeding. Males in the breeding season will raise their heads, looking straight up while "dancing" on the perch next to the female, moving in a side-stepping fashion. The female, if receptive, will crouch down and point her tail to the male.

6. Austroepigomphus praeruptus - Wikipedia

   en.wikipedia.org/wiki/Austroepigomphus_praeruptus

   Austroepigomphus praeruptus, also known as Austroepigomphus (Austroepigomphus) praeruptus, and up until recently Austrogomphus praeruptus, is a species of dragonfly in the family Gomphidae, [5] It is known by the common names, Twinspot Hunter [6] and Melaleuca Hunter. It inhabits slow streams, rivers and ponds in eastern Australia.

7. Phosphor - Wikipedia

   en.wikipedia.org/wiki/Phosphor

   Blue: Combination of zinc sulfide with few ppm of silver, the ZnS:Ag, when excited by electrons, provides strong blue glow with maximum at 450 nm, with short afterglow with 200 nanosecond duration. It is known as the P22B phosphor. This material, zinc sulfide silver, is still one of the most efficient phosphors in cathode-ray tubes. It is used ...