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Khan Academy is an American non-profit [3] educational organization created in 2006 by Sal Khan. [1] Its goal is to create a set of online tools that help educate students. [ 4 ] The organization produces short video lessons. [ 5 ]
An LED-backlit LCD is a liquid-crystal display that uses LEDs for backlighting instead of traditional cold cathode fluorescent (CCFL) backlighting. [1] LED-backlit displays use the same TFT LCD ( thin-film-transistor liquid-crystal display ) technologies as CCFL-backlit LCDs, but offer a variety of advantages over them.
The combination of such reflective polarizers, and LED dynamic backlight control [23] make today's LCD televisions far more efficient than the CRT-based sets, leading to a worldwide energy saving of 600 TWh (2017), equal to 10% of the electricity consumption of all households worldwide or equal to 2 times the energy production of all solar ...
[2] As of January 2025, the Khan Academy channel on YouTube has 8.74 million subscribers, and its videos have been viewed more than two billion times. [3] In 2012, Khan was named in the annual publication of Time 100. [4] In the same year, he was featured on the cover of Forbes, with the tagline "The $1 Trillion Opportunity." [5]
(A1048, white, 109 keys, USB 1.1 and USB 2.0) In May 2003, the keyboard underwent a major redesign which eliminated the frame enclosing the keys while adding an F16 key and moving the USB ports to the back. This revision also renamed the device as just the 'Apple Keyboard', thus dropping 'Pro' from the commercial name, but the complete name ...
A fill flash used with a backlit subject yields more even lighting. The vertical angle of the back light can change the effect. A low angle can make the light hit the camera lens, causing lens flare. A high angle can make the subject's nose extend out from the mostly vertical shadow of the head, producing a potentially unwanted highlight in the ...
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This page lists codes for keyboard characters, the computer code values for common characters, such as the Unicode or HTML entity codes (see below: Table of HTML values"). There are also key chord combinations, such as keying an en dash ('–') by holding ALT+0150 on the numeric keypad of MS Windows computers.