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Wikimedia Commons, or simply Commons, is a wiki-based media repository of free-to-use images, sounds, videos and other media. It is a project of the Wikimedia...

A steroid is an organic compound with four fused rings (designated A, B, C, and D) arranged in a specific molecular configuration. Steroids have two principal...

A solar cell or photovoltaic cell (PV cell) is an electronic device that converts the energy of light directly into electricity by means of the photovoltaic...

Cardiology (from Ancient Greek καρδίᾱ (kardiā) 'heart', and -λογία (-logia) 'study') is the study of the heart. Cardiology is a branch of medicine that...

Herpesviridae is a large family of DNA viruses that cause infections and certain diseases in animals, including humans. The members of this family are...

Feelings are subjective self-contained phenomenal experiences. According to the APA Dictionary of Psychology, a feeling is "a self-contained phenomenal...

Varicella zoster virus (VZV), also known as human herpesvirus 3 (HHV-3, HHV3) or Human alphaherpesvirus 3 (taxonomically), is one of nine known herpes...

A propellant (or propellent) is a mass that is expelled or expanded in such a way as to create a thrust or another motive force in accordance with Newton's...

Timeline of sustainable energy research 2020– documents increases in renewable energy, solar energy, and nuclear energy, particularly for ways that are...

Vision therapy (VT), or behavioral optometry, is an umbrella term for alternative medicine treatments using eye exercises, based around the pseudoscientific...

Posidonia is a genus of flowering plants. It contains nine species of marine plants ("seagrass"), found in the seas of the Mediterranean and around the...

Master Quality Authenticated (MQA) is a proprietary system for delivering high-quality digital audio. The system includes audio signal processing, lossy...

Red Delicious is a type of apple with a red exterior and sweet taste that was first recognized in Madison County, Iowa, in 1872. Today, the name Red Delicious...

Off-the-grid or off-grid is a characteristic of buildings and a lifestyle designed in an independent manner without reliance on one or more public utilities...

Career counseling is a type of advice-giving and support provided by career counselors to their clients, to help the clients manage their journey through...

A perovskite solar cell (PSC) is a type of solar cell that includes a perovskite-structured compound, most commonly a hybrid organic–inorganic lead or...

The Amiga 500, also known as the A500, was the first popular version of the Amiga home computer, "redefining the home computer market and making so-called...

Hybrid power are combinations between different technologies to produce power. In power engineering, the term 'hybrid' describes a combined power and energy...

Injury prevention is an effort to prevent or reduce the severity of bodily injuries caused by external mechanisms, such as accidents, before they occur...

A color rendering index (CRI) is a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison...