Dragon safety

 https://twitter.com/elonmusk/status/1328124552459603968

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Control

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 Control A scientific control is an experiment or observation designed to minimize the effects of variables other than the independent variable.   noun.  English Language Learners Definition of control. The power to make decisions about how something is managed or done. The ability to direct the actions of someone or something. : an action, method, or law that limits the amount or growth of something   There are three main variables: independent variable, dependent variable and controlled variables. Example: a car going down different surfaces. Independent variable: the surface of the slope rug, bubble wrap and wood. Dependent variable: the time it takes for the car to go down the slope.
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Cell

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 Cell Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Cells have many parts, each with a different function.   The Four Main Types of Cells Epithelial Cells. These cells are tightly attached to one another. Nerve Cells. These cells are specialized for communication. Muscle Cells. These cells are specialized for contraction. Connective Tissue Cells.   Human body averages 37.2 trillion cells. This is not a final number, but it's a very good start. While it's true that people may vary in size. ovum The largest cell is ovum in the human body. The ovum also called egg cell is the reproductive cell in the female body. Ovum is 20 times bigger than the sperm cells and has a diameter of about 0.1 mm.
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Telescope

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 Telescope is an optical instrument using lenses, curved mirrors, or a combination of both to observe distant objects, or various devices used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation.   The first person to apply for a patent for a telescope was Dutch eyeglass maker Hans Lippershey (or Lipperhey). In 1608, Lippershey laid claim to a device that could magnify objects three times. His telescope had a concave eyepiece aligned with a convex objective lens.   Primary mirror (for reflecting telescopes), which carries the same role as the primary lens in a refracting telescopes. Eyepiece, which magnifies the image. Mounting, which supports the tube, enabling it to be rotated.   Types of Telescope. There are three main types of telescope. These are refracting telescopes, Newtonian telescopes and Schmidt-Cassegrain telescopes.   The Arecibo radio telescope still represents the largest single-aperture telescope e...
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