Photo Researchers ftp March 2011

Platte River, in Nebraska, during a sunset in March, 2009.

Teddy-bear cholla, (Cylindropuntia bigelovii), and Jumping cholla, (Cylindropuntia fulgida); cholla cactus garden, Joshua Tree National Park, Californ...

Desert Dandelions, (Malacothrix glabrata); Pinto Valley, Joshua Tree National Park, California; April 2009.

Desert Dandelions, (Malacothrix glabrata); Pinto Valley, Joshua Tree National Park, California; April 2009.

Sandhill Crane, (Grus canadensis); migration along the Platte River, Nebraska; March 2009.

Sandhill Crane, (Grus canadensis); migration along the Platte River, Nebraska; March 2009.

Sandhill Crane, (Grus canadensis); migration along the Platte River, Nebraska; March 2009.

Sandhill Crane, (Grus canadensis); migration along the Platte River, Nebraska one foggy morning; March 2009.

Platte River, in Nebraska, during a sunset in March, 2009.

Joshua Tree National Park; April 2009.

Joshua Tree National Park; April 2009.

Standing in the Oasis of Mara; Joshua Tree National Park; 2009.

Grizzly Lake, in the Tombstone Territorial Park, Yukon, Canada; 2009.

Bald Eagle, (Haliaeetus leucocephalus); Alaska, 2009.

Muskox, (Ovibos moschatus); Yukon, Canada; 2008.

Blue laser beam.

Cup made from bioplastic. A cold drink cup made in the USA by Fabri-Kal Corp from polylactic acid (PLA) plastic. PLA is derived from plants and is 100...

Electrical conductivity. A circuit consisting of a battery, light bulb and two electrodes in a beaker is used to illustrate electrical conductivity....

Electrical conductivity. A circuit consisting of a battery, light bulb and two electrodes in a beaker is used to illustrate electrical conductivity....

Electrical conductivity. A circuit consisting of a battery, light bulb and two electrodes in a beaker is used to illustrate electrical conductivity....

Combustion, photo 1. For a combustion reaction to occur, an oxidant is needed. In this series a candle burns steadily in the open air using oxygen fo...

Combustion, photo 2. For a combustion reaction to occur, an oxidant is needed. In this series a candle burns steadily in the open air using oxygen fo...

Combustion, photo 3. For a combustion reaction to occur, an oxidant is needed. In this series a candle burns steadily in the open air using oxygen fo...

Diode conductivity. A diode is an electronic component that conducts current in one direction (forward direction) and blocks current in the opposite...

Diode conductivity. A diode is an electronic component that conducts current in one direction (forward direction) and blocks current in the opposite...

Conductivity test. A battery and a light bulb are used to test electric conductivity of different materials. As shown here, a glass rod does not cond...

Conductivity test.A battery and a light bulb are used to test electric conductivity of different materials. As shown here, a wooden stick does not con...

Conductivity test. A battery and a light bulb are used to test electric conductivity of different materials. As shown here, a plastic fork does not c...

Conductivity test. A battery and a light bulb are used to test electric conductivity of different materials. As shown here, a rubber eraser does not...

Conductivity test. A battery and a light bulb are used to test electric conductivity of different materials. As shown here, plastic insulation coveri...

Conductivity test. A battery and a light bulb are used to test electric conductivity of different materials. As shown here, a copper wire conducts el...

Conductivity test. A battery and a light bulb are used to test electric conductivity of different materials. As shown here, a stainless steel fork co...

Conductivity test. A battery and a light bulb are used to test electric conductivity of different materials. As shown here, an iron nail conducts ele...

Conductivity test. A battery and a light bulb are used to test electric conductivity of different materials. As shown here, an piece of aluminum foil...

Conductivity test. A battery and a light bulb are used to test electric conductivity of different materials. As shown here, a graphite core from a co...

Depth of field, photo 1 of 3. .Two chess knights are used to demonstrate how depth of focus depends on the f-stop. Photo 1 was taken with the aperture...

Depth of field, photo 2 of 3. .Two chess knights are used to demonstrate how depth of focus depends on the f-stop. Photo 1 was taken with the aperture...

Depth of field, photo 3 of 3. Two chess knights are used to demonstrate how depth of focus depends on the f-stop. Photo 1 was taken with the aperture...

Liquid pressure. In a gravitational field liquid pressure increases with depth. Here, a plastic bottle has three small holes on its side. The speed o...

Scanning electron micrograph (SEM) of side view of mammalian small intestinal villi. Magnification: 600x.

Scanning electron micrograph (SEM) of side view of mammalian small intestinal villi. Magnification: 600x.

Scanning electron micrograph (SEM) of mammalian small intestine with food remnants on the tips of the villi. Magnification: 180x.

Scanning electron micrograph (SEM) of mammalian small intestine with food remnants on the tips of the villi. Magnification: 180x.

Scanning electron micrograph (SEM) of human intestinal mucosa. This is a portion of epithelial muscosa from the descending colon, which shows intervil...

Scanning electron micrograph (SEM) of human intestinal mucosa. This is a portion of epithelial muscosa from the descending colon, which shows intervil...

Transmission electron micrograph (TEM) of a section of ileum (final section of the small intestine) showing columnar cells (orange), goblet cell (purp...

Transmission electron micrograph (TEM) of a section of ileum (final section of the small intestine) showing columnar cells (purple), goblet cell (red)...

Transmission electron micrograph (TEM) of a section of ileum (final section of the small intestine) showing columnar cells (blue), goblet cell (yellow...

Transmission electron micrograph (TEM) of a section of ileum, the final section of the small intestine. Longitudinal section of villus, showing centr...

Transmission electron micrograph (TEM) of a section of ileum, the final section of the small intestine. Longitudinal section of villus, showing centr...