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Red (635 nm), blueish violet (445 nm), and green (520 nm) laser pointers. A laser pointer or laser pen is a (typically battery-powered) handheld device that uses a laser diode to emit a narrow low-power visible laser beam (i.e. coherent light) to highlight something of interest with a small bright colored spot.
A speaker giving a presentation with an RF pointer in his left hand. Using a wireless clicker, helps the presenter to move freely, instead of being obliged to stay next to the computer, can get closer and keep in touch with the audience, watching the presentation together with them, being able to use the built-in laser pointer, in order to emphasize specific points in the dialogue with the ...
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For those on the go, a physical keyboard can be a hassle. Save some room with this laser projection keyboard.
The theme of World Teachers' Day 2023 is "The teachers we need for the education we want". Teachers are the heart of education and in many countries are leaving the profession they love, and fewer young people aspire to become one. UNESCO estimates that the world needs over 69 million new teachers by 2030, and the shortage only continues to ...
The five-day strike began Friday and initially shut down Starbucks locations in Los Angeles, Chicago and Seattle before spreading to cafes in New Jersey, New York, Philadelphia, St. Louis, Denver ...
Light level 5.0 μW/cm 2; for example, a legal 5 mW laser pointer at 1,200 feet (370 m). Simulation of temporary flash blindness where the image takes from a few seconds to a few minutes to fade away, depending on how much light entered the eye. Light level 50 μW/cm 2; for example, a legal 5 mW laser pointer at 350 feet (110 m).
The world’s oldest known wild bird has sparked “special joy” among scientists after she laid an egg – her first in four years – at the age of 74.