Microscopic World On A Human Scale
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The vast differences in the size of things we can’t see with the naked eye, from the tiniest atom to the relatively gargantuan amoeba.

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DEFINITIONS:  Cesium:  A type of metal that is silvery-gold in color. It is very reactive and is used in a variety of applications, including in atomic clocks, to make chemicals and glass, and in medicine. Chloroplasts:  Tiny structures found found in plant cells that help the plant turn sunlight into energy.    Euglena:  Small, one-celled organisms that live in water and can move around using a whip-like tail. They have some features of both plants and animals and can make their own food using sunlight or get energy by eating other things.    Diatoms:  Small plants that live in water and have cell walls made of glass-like material. They are an important part of the ocean's food chain and are used to measure water quality.    Paramecium:  A type of tiny, one-celled organism that lives in water and moves using small, hair-like structures on its surface. It eats other things to survive and can make more of itself without needing to mate with another organism. Scientists study it to learn about how cells work.    Fragile Giant:  A life-like sculpture of an elephant measuring 0.157 mm in height and created by Jonty Hurwitz (UK) in 2015 using a 3D printing technique called Nano-Particle Jetting. The sculpture measures just 0.157 mm in height, which is about one-tenth the width of a human hair. Despite its tiny size, the sculpture is highly detailed and features intricate features such as the elephant's trunk, tusks, and wrinkles on its skin.    Rotifers:  Small animals that live in water. They have a crown of tiny hair-like structures on their head that helps them move and find food. Rotifers are found in many different types of water, including rivers, lakes, and ponds. They are used in scientific research because they are small and have a short life span.    Amoeba:  A small, single-celled organism that lives in water. It moves around by using temporary extensions of its cell membrane. Amoebas eat other organisms to survive. They are able to consume their food by engulfing it and breaking it down.    Tardigrades:  Small animals that are found in many different environments, including soil, water, and plants. They have eight legs and a round or tubular body. Tardigrades are known for their ability to survive extreme conditions, such as extreme temperatures and lack of water. They are able to do this by entering a state of suspended animation. Tardigrades are usually less than 1 millimeter in size.      Viewer comments:  "Even when we visualize a size comparison of the smallest objects, things we can't even see without specific tools, a full human body wouldn't cover the distance to the nearest solar system to us."    "I remember reading about atoms: 'If an atom is the size of your thumbnail, your hand would be able to grasp the Earth!' This video just illustrated that."
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