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As a proof of the concept, he constructed a telescope using reflective mirrors instead of lenses as the objective to bypass that problem. [ 66 ] [ 67 ] Building the design, the first known functional reflecting telescope, today known as a Newtonian telescope , [ 67 ] involved solving the problem of a suitable mirror material and shaping technique.
8.7% global prevalence in 2020 [2] Macular degeneration, also known as age-related macular degeneration (AMD or ARMD), is a medical condition which may result in blurred or no vision in the center of the visual field. [1] Early on there are often no symptoms. [1] Over time, however, some people experience a gradual worsening of vision that may ...
The Photomic series of prisms, which was initially designed with a direct coupled-metering CdS photocell (2 models were produced). The Photomic prism head later evolved to include the Photomic T with TTL in 1965, a behind-the-lens metering prism head which metered an averaging pattern of the focusing screen.
A new study finds that weight loss drugs Like Ozempic could trigger bone loss. Doctors explain why, and how to protect yourself if you take one of these drugs.
Skin color contrast has been identified as a feminine beauty standard observed across multiple cultures. [7] Women tend to have darker eyes and lips than men, especially relative to the rest of their facial features, and this attribute has been associated with female attractiveness and femininity, [7] yet it also decreases male attractiveness according to one study. [8]
Signature. Alice O'Connor (born Alisa Zinovyevna Rosenbaum; [ c ] February 2 [ O.S. January 20], 1905 – March 6, 1982), better known by her pen name Ayn Rand (/ aɪn / EYEN), was a Russian-born American author and philosopher. [ 3 ] She is known for her fiction and for developing a philosophical system she named Objectivism.
The Sun is the star at the center of the Solar System.It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light and infrared radiation with 10% at ultraviolet energies.
Methamphetamine[ note 1 ] (contracted from N-methylamphetamine) is a potent central nervous system (CNS) stimulant that is mainly used as a recreational or performance-enhancing drug and less commonly as a second-line treatment for attention deficit hyperactivity disorder and obesity. [ 23 ] It has also been researched as as a potential ...