Polymorphic light eruption (PMLE) is a common skin disease caused by exposure to sunlight, resulting in an itchy red rash that disappears within a week but reappears upon further exposure. The cause is unknown, but it is thought to be an acquired reaction to ultraviolet light. Treatment includes topical corticosteroids, antihistamines, and desensitization therapy. PMLE […]
Kmart’s blue light special sale gimmick, consisting of surprise price cuts on specific merchandise, was successful in the past but phased out in 1991. It was revived in 2001 but customers were not as enthusiastic. Kmart filed for bankruptcy and restructured marketing efforts, including the creation of BlueLight.com. The blue light special was reintroduced in […]
Pack light when traveling by starting with a roller or duffel bag, putting heavy items like shoes at the bottom, and using separate drawstring bags for shoes. Use clear plastic bottles and a vinyl cosmetic bag for toiletries. Roll clothes neatly and stick to two neutral and two accent colors. Experienced packers plan their outfits […]
Industrial Light and Magic (ILM) is a San Francisco-based visual effects studio founded by George Lucas in the 1970s. ILM has won 16 US Academy Awards for Best Visual Effects and 20 Technical Academy Awards. ILM pioneered motion control cameras and computer-generated imagery (CGI) and created breakthroughs in photorealistic animal animation. ILM’s innovations have influenced […]
Lightweight design is a software development technique that uses small processes, such as Scrum, to streamline the development process and reduce delays. It focuses on modular development and interactive communication with customers to meet their needs. Smartphones are an example of products developed using lightweight design. Computer software development is a complex process that includes […]
A ghost light is a light left on in theaters after closing to reduce the risk of injury and liability. It has a superstitious tradition dating back to Shakespeare’s time. The light can be explained as either keeping ghosts away or allowing them to perform. It consists of a bare bulb on a movable pole […]
Light periods can be caused by hormonal changes, birth control pills, eating disorders, stress, and medical conditions such as autoimmune disorders, thyroid problems, and polycystic ovarian syndrome. Hormonal changes during perimenopause can also lead to lighter periods. There are many things that can cause a woman to have a light period. Among the most common […]
A light year is the distance light travels in a year through a vacuum. Astronomers use it to describe large distances. Our solar system would have to be 800 times larger to have a diameter of one light-year. The closest star is Proxima Centauri at 4.2 light-years away. By knowing how fast light travels, we […]
Light Peak, now known as Thunderbolt, is a computer cable technology designed by Intel to replace multiple connections found on computers and devices. It supports data rates up to 100 gigabits per second, can support existing connection technologies, and allows for daisy-chaining of devices. Thunderbolt-compatible products were announced in 2011, with both electrical and optical […]
The tired light theory proposes that the redshift observed in distant galaxies is due to the gradual dissipation of light energy as it travels through space. However, it faces several problems, including the perceived brightness of galaxies and the pattern of light emission from supernovae. The big bang theory is favored by most astronomers and […]
Semaphores are special variables used in computer programming to signal counters and true-false statements. They are prevalent in object-oriented programming and used for synchronization and handling triggers. They simplify code maintenance and logic flow, and are used in timers and counter processes. Semaphores are also used in operating systems to coordinate complex tasks for multiple […]
Thomas Edison improved upon previous inventions to create the first commercially efficient and widely used light bulb. Many inventors worked on inventing a long-lasting incandescent light bulb, but Edison succeeded in 1879. Nikola Tesla’s AC technology paved the way for more powerful electricity and light. The incandescent light bulb is inefficient, and many countries have […]
Light is electromagnetic radiation with electric and magnetic fields. Ultraviolet light has a shorter wavelength, higher frequency, and higher energy than visible light. UVA, UVB, and UVC classify ultraviolet light by wavelength and energy. Most UV light is absorbed by the ozone layer, but UVA causes tanning and sunburn and is essential for vitamin D […]
Light sensors detect light and come in various types, such as photocells, CCDs, and photomultipliers. They are used in everyday objects like security systems, electronic devices, and barcode scanners. Infrared technology is increasingly used in motion-activated light sensors, saving energy costs. Light sensors are also used in scientific breakthroughs, such as in robotics and fiber […]
Light soy sauce is a thinner, saltier condiment commonly used as a dipping sauce and flavoring in stir-fried dishes. It can also be used as a marinade for tofu and noodles and as a dipping sauce for dumplings and sushi. Consumers should read nutritional information for sodium content. Light soy sauce is a condiment of […]
The speed of light in a vacuum is constant and any experiment suggesting otherwise is viewed with suspicion. The speed of light is variable in different mediums, with some having a high refractive index that can slow or even stop light. However, the slowdown is illusory as the speed of light never actually slows down. […]
Digital artists and the public are turning to light pens as a replacement for computer mice. Light pens are lightweight and can be used like a regular pen or mouse. They work for both right and left-handed individuals and some models are wireless. However, they can be fragile and take some getting used to. They […]
A light pen can refer to a pen with an LED lamp, a pen for long exposure photography, a tablet pen, or an input device for a computer display. The prototype was made by the Whirlwind Project at MIT and works by selecting dots on a CRT screen. While lightweight pens were popular in the […]
White light is created by combining all colors of the visible light spectrum. It is emitted by sources such as the sun, incandescent bulbs, and fluorescent lamps. White light is part of the electromagnetic spectrum, and filtering it gives objects their colors. Some holistic healers believe white light stores positive energy and can purify and […]
A light microscope uses visible light and lenses to view small objects, magnifying them up to 1000 times. It consists of an objective, ocular lens, stage, light source, condenser, tube, and focusing system. Most microscopes today are compound microscopes with multiple lenses. The concept of lenses was discovered by the Romans, and Anton Von Leeuwenhoek […]
