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Project

1-Wire Weather Station

The weather station in this project is quite basic, measuring only temperature, pressure, and humidity, but it may be easily expanded to measure other weather components, such as wind speed and rainfall. The design is based on using a series of…

Project

3D Skull Candy Mold

Whether preparing for Halloween or just a regular day, you can make skull-shaped edibles from this project's 3D candy mold. Like many molds, this one is a hollow container into which you can pour water or hot liquids, such as gelatin, chocolate, or…

Project

3D Terrain Map

Terrain maps are physical models that give you an at-a-glance overview of landforms. Architects, builders, and engineers often use these types of maps to provide context to proposed building designs. In this project, you'll create a layered…

Project

Wind Lantern

In this project, you will build a small, vertical-axis wind turbine, or VAWT for short. VAWTs are not as efficient as their horizontal-axis cousins, but they are better suited to urban environments where wind can come from different…

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from article Wool

Sheep at a research facility near Dubois, Idaho. (Photo courtesy of the Agricultural Research Service, U.S. Department of Agriculture)

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from article Wool

Longitudinal section of a completely developed nonmedullated wool follicle, including sebaceous and sweat glands.

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from article Wool

Cuticle, cortex, and medulla of a wool fiber.

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from article Wool

Scale formation of Delaine Merino wool fibers.

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from article Wool

Fine wool staples showing distinct crimp (wavy) patterns. The length shown is the minimum for each classification.

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from article Molybdenum

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from article Brazil nut

Unshelled Brazil nuts (Bertholletia excelsa). (Photo courtesy of C. E. Timothy Paine)

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from article Cerargyrite

Cerargyrite crystals from Leadville, Colorado. (Specimen from Department of Geology, Bryn Mawr College)

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from article Staining

Photomicrograph of Mycobacterium tuberculosis (the causative agent of tuberculosis) using the acid-fast Ziehl-Neelsen carbol fuchsin stain. In this case, the M. tuberculosis bacteria stain red (or reddish purple), whereas non-acid-fast species stain…

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from article Staining

Staining of Klebsiella bacteria using crystal violet. (Credit: Lisa Burgess/McGraw-Hill Education)

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from article Staining

Photomicrograph of a Gram-stained urethral exudate sample from a male who presented with a case of urethritis. Numerous extracellular Gram-negative Neisseria gonorrhoeae bacteria are evident. (Credit: Norman Jacobs/U.S. Centers for Disease Control…

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from article Castor plant

Seeds of the castor plant (Ricinus communis). These seeds, which are also known as castor beans, are processed to make castor oil. (Credit: Brian Prechtel/Agricultural Research Service, United States Department of Agriculture)

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from article Cowpea

Cowpea (Vigna unguiculata): pods and leaves. (Photo by Howard F. Schwartz, Colorado State University)

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from article Cowpea

Cowpea seeds, which are often called black-eyed peas. (Photo by Joseph Berger; Bugwood.org)

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from article Salmon farming

Adult Atlantic salmon (Salmo salar). (Credit: William Hartley/U.S. Fish and Wildlife Service)

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from article Salmon farming

Atlantic salmon (Salmo salar) at a pre-smolt stage. (Credit: Edward Peter Steenstra/U.S. Fish and Wildlife Service)

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from article Salmon farming

A congregation of coho salmon (Oncorhynchus kisutch) released from a hatchery. Investigators continue to study the effects of farmed fish on neighboring populations of wild salmonids. (Credit: Salmon Ecology Team/Southwest Fisheries Science Center,…

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from article Sulfur

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from article Granulite

Southern part of peninsular India and Sri Lanka, showing broad tectonic and metamorphic features. (After A. P. Subramaniam, Charnockites and granulites of southern India: A review, Dan. Geol. Foren., 17:473–493, 1967)

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from article Kumquat

Fruits and foliage of the Nagami kumquat (Fortunella margarita). (Photo by Forest and Kim Starr)

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from article Melilite

Melilite crystals from Vesuvius, Italy. (Specimen from Department of Geology, Bryn Mawr College)

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from article Mulberry

White mulberry (Morus alba). (Photo courtesy of Forest and Kim Starr)

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from article Jawless vertebrate

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from article Beech

Leaf on top of bark of American beech (Fagus grandifolia). (Photo courtesy of Robert H. Mohlenbrock, USDA–NRCS PLANTS Database)

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from article Beech

Beechnuts of the American beech (Fagus grandifolia). (Photo courtesy of Steve Hurst, USDA–NRCS PLANTS Database)

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from article Schuler pendulum

Basic principles illustrated by (a) simple pendulum; (b) Earth-radius pendulum; (c) solid pendulous rod.

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from article Schuler pendulum

Behavior of pendulous rod when accelerated about Earth. (a) Short-period pendulous rod. (b) Schuler-period pendulous rod. (c) Nonpendulous rod.

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from article Schuler pendulum

Gyropendulum; thrust bearing provides extra freedom, necessary for gyroscopic action.

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from article Schuler pendulum

Principle of Schuler-tuned stable platform.

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from article Psocoptera

Valenzuela flavidus, male (family Caeciliusidae): habitus (general appearance). Body length: 2.02 mm (0.08 in.).

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from article Psocoptera

Metylophorus novaescotiae, female (family Psocidae): habitus. Body length: 5.24 mm (0.2 in.).

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from article Psocoptera

(a–e) Mouthparts of a typical psocid, Echmepteryx hageni (family Lepidopsocidae): a = labrum, b = maxilla (l = lacinia), c = hypopharynx (li = lingual sclerite), d = mandible, e = labium. Scale: 0.1 mm (0.004 in.). (f) Wing venation of a typical…

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from article Psocoptera

Liposcelis brunnea, female (family Liposcelididae): habitus of a cleared specimen. Body length: 1.1 mm (0.043 in.).

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from article Catalysis and catalysts

The Hoveyda-Grubbs catalyst, molecular formula C31H38Cl2N2ORu, is a ruthenium-based metathesis catalyst.

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from article Oil sand

Tar sand deposits in Alberta. 1 mi = 1.6 km.

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from article Superacid

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from article Superacid

Hammett acidity function (H0) values for some solutions in 100% H2SO4. (After E. F. Caldin and V. Gold, eds., Proton Transfer Reactions, Chapman and Hall, 1975)

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from article Superacid

Hammett acidity function (H0) values for acids of the fluorosulfuric acid solvent system. (After E. F. Caldin and V. Gold, eds., Proton Transfer Reactions, Chapman and Hall, 1975)

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from article Superacid

Hammett acidity function (H0) values for some HF−MF5 systems.

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from article Lightning

Charge distribution in storm clouds. (Credit: NOAA)

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from article Lightning

Natural cloud-to-ground lightning near Tucson, Arizona. Note that each discharge strikes the ground in more than one place. (Credit: Michael J. Leuthold)

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from article Lightning

Sprites, elves, and blue jets are transient luminous events in the upper atmosphere associated with thunderstorms. (Credit: NOAA)

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from article Marjoram

Close-up view of marjoram (Majorana hortensis; alternatively Origanum majorana). (Photo courtesy of Forest and Kim Starr)

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from article Colloid

Examples of colloid particles. (a) Zinc sulfide (sphalerite). (b) Cadmium carbonate, with an enlargement of the boxed section (courtesy of Egon Matijević).

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from article Prehistoric technology

Elements of stone flaking. (a) Relationship between the core and the flake. (b) Major feature of the ventral or release surface of the flake. (After I. Tattersall, E. Delson, and J. A. Van Couvering, eds., Encyclopedia of Human Evolution and…

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from article Prehistoric technology

Principal techniques of stone-tool manufacture. (a) Hard-hammer, with free-hand percussion. (b) Anvil technique. (c) Bipolar technique. (d) Soft-hammer percussion. (e) Indirect percussion or punch technique. (f) Pressure flaking. (After…

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1-Wire Weather Station

3D Skull Candy Mold

3D Terrain Map

Wind Lantern

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