71076052 - Physician of Denali Rescue is testing an emergency oxygen system, high on Mt. McKinley. With this system patients can be administered low concentration of oxygen, that will help them recover from altitude sickness, when descending the mountain.14088790 - Olay billabourd LOFT store hotel in Broadway, Times square subway Manhattan, New York City, USA13888402 - Low Angle View Of A Building With Curves To Give A Bumpy Facade; Chicago Illinois United States Of America13888401 - Low Angle View Of The John Hancock Centre Against A Blue Sky; Chicago Illinois United States Of America13888400 - Low Angle View Of A Skyscraper Against A Blue Sky; Chicago Illinois United States Of America13887968 - American Gothic Statue And The Tribune Tower; Chicago Illinois United States Of America13846793 - Tick seen through a microscope for research into Deer tick and Lyme disease at College Park, Maryland, USA13846313 - Scientist inspects captured insects in a tube of liquid13845058 - Scientist conducting Lyme disease research with deer ticks13811354 - Giant Swallowtail (Papilio Cresphontes) on Butterfly Bush (Buddleja davidii) Marion County, Illinois13806023 - American goldfinch male on hollyhock, Marion County, Illinois.13805779 - Aerial of snowy trees, Marion County, Illinois.13790024 - Cloud Gate (The Bean) Sculpture In Front Of Skyscrapers At Night, Chicago,Illinois,Usa13787520 - Skyline Of Chicago, Illinois, Usa13787519 - Skyline Of Chicago, Illinois, Usa13787499 - Reflection Of Skysline, Chicago, Illinois, Usa13787495 - Colorful Skyscraper13899684 - Portrait of young caucasian boy with a broken and cast arm wearing a hat and sitting in a chair outdoor in a garden. Lifestyle concept.13898190 - Closeup of a young boy with a broken and cast arm sitting in a chair outdoor in a garden. Lifestyle concept.13888428 - Skyline Against A Blue Sky And The Waterfront; Chicago Illinois United States Of America13888046 - Plants And Flowers In An Urban Garden With Skyscrapers Against A Blue Sky; Chicago Illinois United States Of America13887970 - American Gothic Statue And A Skyscraper; Chicago Illinois United States Of America13847974 - Vials in a container for Lyme disease research in College Park, Maryland, USA13811340 - Farmer harvesting soybeans at sunset, Marion County, Illinois13806018 - Northern cardinal male in spruce tree in winter snow, Marion County, Illinois.13806016 - Northern cardinal male in fir tree in snow, Marion County, Illinois.13787493 - Colorful Skyscraper13787492 - Skyscrapers, Chicago, Illinois, Usa; Chicago, Illinois, Usa13787482 - Downtown Chicago, Illinois, Usa; Chicago, Illinois, Usa71425488 - Aerial view of spruce trees dying from climate change in the Bavarian Forest, Germany13888426 - Skyline With Skyscrapers Against A Blue Sky; Chicago Illinois United States Of America13888407 - Pedestrians Walking On The Promenade At Navy Pier With Skyscrapers In The Background; Chicago Illinois United States Of America13888403 - Buildings With Various Architectural Design; Chicago Illinois United States Of America13887973 - Skyscrapers Viewed Through A Grey Metal Railing; Chicago Illinois United States Of America13887972 - Pedestrians On A Path In An Urban Park With A Tall Building; Chicago Illinois United States Of America13846887 - Mosquito in the lens of a microscope13846766 - Tweezers pointing to a tick while doing Lyme disease research in College Park, Maryland, USA13811349 - Ruby-throated Hummingbird (Archilochus colubris) at Salvia 'Love and Wishes' Marion County, Illinois13811348 - Great Gray Owl (Strix nebulosa) Yellowstone National Park, Wyoming13811333 - Monarch Butterflies (Danus plexippus) roosting in Eastern Red Cedar (Juniperus virginiana) Prairie Ridge State Natural Area, Marion County, Illinois13811331 - Giant Swallowtail butterfly (Papilio cresphontes) newly emerged near chrysalis, Marion County, Illinois13811330 - Red-bellied Woodpecker (Melanerpes carolinus) male in flower garden, Marion County, Illinois13811329 - Ruby-throated Hummingbird (Archilochus colubris) at Red Pentas (Penta lanceolata) in Marion County, Illinois13787472 - Statue Of Grant Wood; Chicago, Illinois, Usa13787459 - Downtown Chicago, Illinois, Usa13776347 - This delicate lettuce coral colony (Pachyseris speciosa) is located in Goofnuw Channel off the island of Yap; Yap, Federated States of Micronesia13899065 - Portrait of young caucasian boy with a broken and cast arm wearing a hat and sitting in a chair outdoor in a garden. Lifestyle concept.13897702 - Portrait of young caucasian boy with a broken and cast arm sitting in a chair outdoor in a garden. Lifestyle concept.13888425 - Sculpture On A Wall With Skyscrapers In The Background Against A Blue Sky; Chicago Illinois United States Of America13888404 - Skyscrapers Against A Blue Sky And A Bridge Over Lasalle Street; Chicago Illinois United States Of America13844560 - Scientist in necropsy lab wearing safety equipment13811361 - Flowering Dogwood Tree (Cornus florida) in spring Stephen A. Forbes St. Park.13811353 - Black Swallowtail (Papilio Polyxenes) male on Brazilian Verbena (Verbena Bonariensis) Marion County, Illinois13811347 - Greater Prairie-Chicken (Tympanuchus Cupido) male displaying on lek Prairie Ridge State Natural Area, Marion County, Illinois13806021 - Northern cardinal male and female in spruce tree in winter snow, Marion County, Illinois.13805780 - Aerial of snow-covered woods Stephen A. Forbes State Park, Marion County, Illinois.13787521 - Downtown Skyscrapers Of Chicago, Illinois, Usa13787468 - Art Deco Board Of Trade Building; Chicago, Illinois, Usa13897936 - Portrait of young caucasian boy with a broken and cast arm wearing a hat and sitting in a chair outdoor in a garden. Lifestyle concept.13888441 - People In The Water And On The Beach With Skyscrapers In The Background; Chicago Illinois United States Of America13888436 - Low Angle View Of Two Round Skyscrapers; Chicago Illinois United States Of America13888405 - Kinzie Street Bridge Lifted Over The Chicago River; Chicago Illinois United States Of America13888399 - A Clock Hanging Over The Entrance To A Building; Chicago Illinois United States Of America13845504 - Scientist in necropsy lab wearing safety equipment13811363 - Purple coneflower, Day Preserve, Illinois13811350 - Ruby-throated Hummingbird (Archilochus colubris) at Amistad Salvia (Salvia amistad) in Marion County, Illinois13811334 - Monarch Butterflies (Danus plexippus) roosting in Eastern Red Cedar (Juniperus virginiana) Prairie Ridge State Natural Area, Marion County, Illinois13806019 - Northern cardinal male in spruce tree in winter snow, Marion County, Illinois.13787517 - Skyline Of Chicago, Illinois, Usa13787513 - Downtown Chicago, Illinois, Usa13787471 - Boat On A River In Chicago; Chicago, Illinois, Usa13897951 - Portrait of young caucasian boy with a broken and cast arm sitting in a chair outdoor in a garden. Lifestyle concept.13897853 - Portrait of young caucasian boy with a broken and cast arm wearing a hat and sitting in a chair outdoor in a garden. Lifestyle concept.13888427 - A Raised Bridge Over The Chicago River; Chicago Illinois United States Of America13888422 - Low Angle View Of The John Hancock Centre; Chicago Illinois United States Of America13887971 - Low Angle View Of Skyscrapers Against A Blue Sky; Chicago Illinois United States Of America13845035 - Insects in a petri dish for inspection in laboratory13811358 - American Lady (Vanessa virginiensis) on Butterfly Bush (Buddleja davidii) Marion County, Illinois13811355 - Cabbage White (Pieris Rapae) on Butterfly Bush (Buddleja davidii) Marion County, Illinois13811352 - American Bullfrog (Lithobates catesbeianus) in pond with duckweed Marion County, Illinois13811351 - House Wren (Troglodytes aedon) male singing in the rain on nest box. Marion County, Illinois13811346 - Great Egret (Ardea alba) feeding in wetland in fog, Marion County, Illinois13811345 - Great Egret (Ardea alba) fishing in wetland in fog, Marion County, Illinois13811336 - Trumpeter Swans in flight (Cygnus buccinator) on white background, Marion County, Illinois13811332 - Monarch Butterflies (Danus plexippus) roosting in Eastern Red Cedar (Juniperus virginiana) Prairie Ridge State Natural Area, Marion County, Illinois13806020 - Northern cardinal males in spruce tree in winter snow, Marion County, Illinois.13787481 - Skyline, Chicago, Illinois, Usa13882361 - View of the Chicago skyline with Lake Michigan; Chicago, Cook County, Illinois, United States of America13882343 - Cityscape of iconic office towers along the Chicago River, with view of the London Guarantee Building, Mather Tower, 35 East Whacker Building and the Kemper Building in the City of Chicago at dusk; Chicago, Cook County, Illinois, United States of America13882342 - View of skyscrapers at Grand Avenue in downtown Chicago; Chicago, Cook County, Illinois, United States of America13882339 - View of the Chicago River crossing the DuSable Bridge and cityscape of iconic office towers, with 333 North Michigan, the London Guarantee Building, Mather Tower, 35 East Whacker Building and the Kemper Building in the City of Chicago at night; Chicago, Cook County, Illinois, United States of America13893379 - Cityscape, Chicago, Illinois, USA13893366 - Chicago Skyline, Illinois, USA13882346 - Route 66 sign in the City of Chicago; Chicago, Cook County, Illinois, United States of America13882344 - View of the Chicago River crossing and cityscape of iconic office towers, with 333 North Michigan, the London Guarantee Building, Mather Tower, 35 East Whacker Building and the Kemper Building in the City of Chicago on a rainy evening; Chicago, Cook County, Illinois, United States of America13882340 - Lake Point Tower, the Jardine Water Purification Plant and Navy Pier stretching out along the shores of Lake Michigan in the City of Chicago under a cloudy sky; Chicago, Cook County, Illinois, United States of America13882337 - View of the Chicago River with the Wabash Avenue Bridge (Irv Kupcinet Bridge) and cityscape of iconic office towers of the City of Chicago at night; Chicago, Cook County, Illinois, United States of America13712667 - City street at dusk13893378 - Chicago, Illinois, USAnext page