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SciShow
Why Do Razor Blades Dull so Quickly?
If you shave regularly, you may have noticed your razor blades don’t cut as well after just a few uses. But why do razors get dull so quickly?
Visual Learning Systems
Microscopic Life: Seeing Microscopic Life
Upon viewing the Microscopic Life video series, students will be able to do the following:
Understand that only during the past few hundred years have people been able to see and study very small life forms, generally referred to as...
Getty Images
Blood vessels from the external wall of the small intestine, coloured scanning electron micrograph (SEM).
This is a cast: the vessels were filled with a resin, which then set. The surrounding tissues were then eaten away chemically, leaving the cast of the vessels. Magnification: x21 when printed 10cm wide.'
Getty Images
Athletes foot. Coloured scanning electron micrograph (SEM) of spores (yellow) of the fungus that causes athletes foot (Tinea pedis) on the skin of a human foot (pink).
The fungus usually grows between the toes, but may spread to the bottom and sides of the foot. The spores can lie dormant for long periods, until conditions are favourable for germination. Treatment involves keeping the infected area dry...
Getty Images
TEMPUR memory foam, animated coloured scanning electron micrograph (SEM).
This viscoelastic memory foam, made from polyurethane, was originally developed in the 1970s at NASA Ames Research Center, California, USA, to improve seating comfort and g-force protection in spacecrafts. After it was abandoned by NASA,...
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Chaffinch foot. Animated coloured scanning electron micrograph (SEM) of a chaffinch foot (Fringilla coelebs). This bird is a common species found in gardens and woodlands all over Europe
Chaffinch foot. Animated coloured scanning electron micrograph (SEM) of a chaffinch foot (Fringilla coelebs). This bird is a common species found in gardens and woodlands all over Europe
Getty Images
Natural sesame seed. Animated coloured scanning electron micrograph (SEM) of the surface of a natural (unhulled) sesame seed.
Sesame (Sesamum indicum) is grown primarily for the seeds it produces. The seed is used whole in cooking or pressed for it's oil
Getty Images
Dollar Light Flare
Currency, Printing Plant, Printing Press, Dollar, Dollar Sign, Money Press, Benjamin Franklin, Animation - Moving Image, Lens Flare, Concepts And Ideas, Government, Number 100, Finance, US Currency, American One Hundred Dollar Bill
Getty Images
Green cardamom. Animated coloured scanning electron micrograph of a green cardamom (Elettaria cardamomum) fruit pod filled with black seeds.
Cardamom belongs to the ginger family of plants (Zingiberaceae). The seeds have a distinctive lemon-like aroma similar to cumin. It is used as a spice to flavour food, especially rice dishes. Both the seeds and the whole pods are used
Getty Images
Plaque-forming bacteria, coloured scanning electron micrograph (SEM). Dental plaque is a biofilm of bacteria that forms on teeth.
It can lead to tooth decay if not removed by regular brushing. These bacteria are attached to the enamel of a childs milk tooth
Curated OER
A Tour of the Cell
The differences between prokaryotic and eukaryotic cells are explained and the parts of each are highlighted. Discover the major organelles found in an animal cell and each of their functions. Paul Andersen does an excellent job once...
University of Virginia
Uva Virtual Lab: Scanning Electron Microscope (Sem)
Find out what an SEM does and how it does it with this online lab.
Museum of Science
Museum of Science: How the Sem Works
This resource gives a quicktime movie or slide show shows how the Scanning Electron Microscope is used in the world today.