Photo Researchers ftp March 2011

Researchers have found ways to take human stem cells from body tissues other than fetal tissue. These cells may be used to replicate numerous differen...

Researchers have found ways to take human stem cells from body tissues other than fetal tissue. These cells may be used to replicate numerous differen...

Conceptual image of a man's silhouette with stem cells and DNA. Researchers have found ways to take human stem cells from body tissues other than feta...

Conceptual image of a man's silhouette with stem cells and DNA. Researchers have found ways to take human stem cells from body tissues other than feta...

Sulfurous fumaroles at the Volcanoes National Park on the Big Island of Hawaii.

Sulfurous fumaroles at the Volcanoes National Park on the Big Island of Hawaii.

Sulfurous fumaroles at the Volcanoes National Park on the Big Island of Hawaii.

A'a (jagged) lava meets Pahoehoe (smooth) lava near Kilauea crater, Big Island, Hawaii. Pahoehoe lava flows smoothly like water or molasses. A'a lava...

Rays of the sun breaking through clouds. The rays become visible when they emerge through gaps in cloud cover and scatter from dust particles or fine...

Earthquake fissure at Volcanoes National Park near Kilauea on the Big Island of Hawaii.

Fire boat response crews battle the blazing remnants of the off-shore oil rig Deepwater Horizon on April 21, 2010; New Orleans, Louisiana.

Fire boat response crews battle the blazing remnants of the off-shore oil rig Deepwater Horizon on April 21, 2010; New Orleans, Louisiana.

Fire boat response crews battle the blazing remnants of the off-shore oil rig Deepwater Horizon on April 21, 2010; New Orleans, Louisiana.

Scanning electron micrograph of melanoma cell passing through basement membrane.

Scanning electron micrograph of melanoma cell passing through basement membrane.

Scanning electron micrograph (SEM) of a human breast cancer tumor cell. Metastasis of such tumors through the lymphatic system to axillary lymph node...

Scanning electron micrograph (SEM) of a human breast cancer tumor cell. Metastasis of such tumors through the lymphatic system to axillary lymph node...

Empty petri dish.

Gloved hand holding a petri dish with a biohazard symbol.

Gloved hand holding a petri dish.

Petri dish containing Staphylococcus bacteria

American bison with calf (Bison bison) in Yellowstone National Park, WY.

American bison with calf (Bison bison) in Yellowstone National Park, WY.

American bison calf (Bison bison) in Yellowstone National Park, WY.

American bison (Bison bison) calf running in Yellowstone National Park, WY.

American bison calf running in Yellowstone National Park, WY.

American bison calf in Yellowstone National Park, WY.

Black bear (Ursus americanus) in Yellowstone National Park, WY.

Black bear (Ursus americanus) in Yellowstone National Park, WY.

Black bear (Ursus americanus) in Yellowstone National Park, WY.

Grizzly bears (Ursus arctos horribilis) in Yellowstone National Park, WY.

Black Labrador retriever retrieving mallard on Billingsley Creek in southern Idaho.

Pika (Ochotona princeps) on rock in the Frank Church - River of No Return Wilderness, ID.

Grass at sunset.

Roses at sunset.

Grass at sunset.

Great Egret (Adrea alba) feeding nestlings, Duval County, Florida.

Giant Swallowtail Butterfly (Papilio cresphontes), Duval County, Florida. With a wingspan of about 4 - 6 inches, it is the largest butterfly species i...

Giant Swallowtail Butterfly (Papilio cresphontes), Duval County, Florida. With a wingspan of about 4 - 6 inches, it is the largest butterfly species i...

Western Lowland Gorilla (Gorilla gorilla gorilla), which the ICUN classifies as a Critically Endangered species, at the Jacksonville Zoo, Jacksonville...

Western Lowland Gorilla (Gorilla gorilla gorilla), which the ICUN classifies as a Critically Endangered species, at the Jacksonville Zoo, Jacksonville...

Western Lowland Gorilla (Gorilla gorilla gorilla), which the ICUN classifies as a Critically Endangered species, at the Jacksonville Zoo, Jacksonville...

Western Lowland Gorilla (Gorilla gorilla gorilla), which the ICUN classifies as a Critically Endangered species, at the Jacksonville Zoo, Jacksonville...

Jaguar (Panthera onca) at the Jacksonville Zoo, Jacksonville, Florida. The jaguar is the third-largest feline after the tiger and the lion, and the la...

Jaguar (Panthera onca) at the Jacksonville Zoo, Jacksonville, Florida. The jaguar is the third-largest feline after the tiger and the lion, and the la...

Jaguar (Panthera onca) at the Jacksonville Zoo, Jacksonville, Florida. The jaguar is the third-largest feline after the tiger and the lion, and the la...

Jaguar (Panthera onca) at the Jacksonville Zoo, Jacksonville, Florida. The jaguar is the third-largest feline after the tiger and the lion, and the la...

Rainbow Lorikeet (Trichoglossus haematodus), a species of Australian parrot also found in eastern Indonesia, the Solomon Islands, Papua New Guinea, Ne...

Rainbow Lorikeet (Trichoglossus haematodus), a species of Australian parrot also found in eastern Indonesia, the Solomon Islands, Papua New Guinea, Ne...

Meerkat (Suricata suricatta), a member of the mongoose family native to the Kalahari Desert, Africa. Photographed at the Jacksonville Zoo, Jacksonvill...