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    Anthrax bacteria, illustration. Anthrax bacteria (Bacillus anthracis) are the cause of the disease anthrax in humans and livestock. They are gram-positive spore producing bacteria arranged in chains (streptobacilli). — Stock Photo
    Anthrax bacteria, illustration. Anthrax bacteria (Bacillus anthracis) are the cause of the disease anthrax in humans and livestock. They are gram-positive spore producing bacteria arranged in chains (streptobacilli).
    Alzheimer's disease. Illustration of amyloid plaques amongst neurons and neurofibrillary tangles inside neurons. Amyloid plaques are characteristic features of Alzheimer's disease — Stock Photo
    Alzheimer's disease. Illustration of amyloid plaques amongst neurons and neurofibrillary tangles inside neurons. Amyloid plaques are characteristic features of Alzheimer's disease
    Larapinta Trail sign at Simpson's Gap, Central Australia, Northern Territory, Australia — Stock Photo
    Larapinta Trail sign at Simpson's Gap, Central Australia, Northern Territory, Australia
    Mt Sonder at sunrise, West MacDonnell National Park, Northern Territory, Australia — Stock Photo
    Mt Sonder at sunrise, West MacDonnell National Park, Northern Territory, Australia
    Aerial view of the sea and the waves of the island of the mediterranean ocean in the north of israel — Stock Photo
    Aerial view of the sea and the waves of the island of the mediterranean ocean in the north of israel
    Woman Hiking in Ormiston Gorge, West MacDonnell National Park, Northern Territory, Australia — Stock Photo
    Woman Hiking in Ormiston Gorge, West MacDonnell National Park, Northern Territory, Australia
    Substantia nigra. Illustration showing a healthy substantia nigra in a human brain. The substantia nigra plays an important role in reward, addiction, and movement. Degeneration of this structure is characteristic of Parkinson's disease. — Stock Photo
    Substantia nigra. Illustration showing a healthy substantia nigra in a human brain. The substantia nigra plays an important role in reward, addiction, and movement. Degeneration of this structure is characteristic of Parkinson's disease.
    Aerial cityscape, Hong Kong — Stock Photo
    Aerial cityscape, Hong Kong
    Blue water surface with foam in the sea — Stock Photo
    Blue water surface with foam in the sea
    Man standing with arms outstretched under Northern lights over Skogafoss, South Central Iceland, Iceland — Stock Photo
    Man standing with arms outstretched under Northern lights over Skogafoss, South Central Iceland, Iceland
    Serpentine Gorge, West MacDonnell Range, Northern Territory, Australia — Stock Photo
    Serpentine Gorge, West MacDonnell Range, Northern Territory, Australia
    Water surface with green and white waves — Stock Photo
    Water surface with green and white waves
    Beautiful view of path in mountains on nature background — Stock Photo
    Beautiful view of path in mountains on nature background
    Woman Hiking in Ormiston Gorge, West MacDonnell National Park, Northern Territory, Australia — Stock Photo
    Woman Hiking in Ormiston Gorge, West MacDonnell National Park, Northern Territory, Australia
    Ormiston Gorge, West MacDonnell National Park, Northern Territory, Australia — Stock Photo
    Ormiston Gorge, West MacDonnell National Park, Northern Territory, Australia
    Water hole in Ormiston Gorge, West MacDonnell National Park, Northern Territory, Australia — Stock Photo
    Water hole in Ormiston Gorge, West MacDonnell National Park, Northern Territory, Australia
    Mt Sonder at sunrise, West MacDonnell National Park, Northern Territory, Australia — Stock Photo
    Mt Sonder at sunrise, West MacDonnell National Park, Northern Territory, Australia
    River Red Gum tree at Simpson's Gap, Central Australia, Australia — Stock Photo
    River Red Gum tree at Simpson's Gap, Central Australia, Australia
    Sunset over the Heavitree Range near Alice Springs, Northern Territory, Australia — Stock Photo
    Sunset over the Heavitree Range near Alice Springs, Northern Territory, Australia
    Ornamental fountain in front of Central Secretariat, New Delhi, India — Stock Photo
    Ornamental fountain in front of Central Secretariat, New Delhi, India
    Reynisdrangar basalt sea stacks in ocean, South Central Iceland, Iceland — Stock Photo
    Reynisdrangar basalt sea stacks in ocean, South Central Iceland, Iceland
    Northern lights over Diamond beach and Jokulsarlon at night, South central Iceland, Iceland — Stock Photo
    Northern lights over Diamond beach and Jokulsarlon at night, South central Iceland, Iceland
    Woman Hiking on the Larapinta Trail, West MacDonnell National Park, Northern Territory, Australia — Stock Photo
    Woman Hiking on the Larapinta Trail, West MacDonnell National Park, Northern Territory, Australia
    Aerial view of a surfer lying on a surfboard paddling in ocean, Gosford, New South Wales, Australia — Stock Photo
    Aerial view of a surfer lying on a surfboard paddling in ocean, Gosford, New South Wales, Australia
    Woman Hiking on the Larapinta Trail, West MacDonnell National Park, Northern Territory, Australia — Stock Photo
    Woman Hiking on the Larapinta Trail, West MacDonnell National Park, Northern Territory, Australia
    Hiking sign and hiking gear on the Larapinta Trail, Simpson's Gap, Central Australia, Northern Territory, Australia — Stock Photo
    Hiking sign and hiking gear on the Larapinta Trail, Simpson's Gap, Central Australia, Northern Territory, Australia
    Skogafoss waterfall at night, Skogar, South Central Iceland, Iceland — Stock Photo
    Skogafoss waterfall at night, Skogar, South Central Iceland, Iceland
    Reynisfjara black sand beach, South Central Iceland, Iceland — Stock Photo
    Reynisfjara black sand beach, South Central Iceland, Iceland
    Mt Sonder summit and spinifex plants at sunrise, West MacDonnell National Park, Northern Territory, Australia — Stock Photo
    Mt Sonder summit and spinifex plants at sunrise, West MacDonnell National Park, Northern Territory, Australia
    Woman Hiking on the Larapinta Trail, West MacDonnell National Park, Northern Territory, Australia — Stock Photo
    Woman Hiking on the Larapinta Trail, West MacDonnell National Park, Northern Territory, Australia
    The empty piazza of Unity of Italy square, historic buildings and street lights. — Stock Photo
    The empty piazza of Unity of Italy square, historic buildings and street lights.
    Cross-section of spinal cord, light micrograph. — Stock Photo
    Cross-section of spinal cord, light micrograph.
    Sri Gethuk waterfall, Yogyakarta, Central Java, Indonesia — Stock Photo
    Sri Gethuk waterfall, Yogyakarta, Central Java, Indonesia
    Road through rural landscape, South Central Iceland, Iceland — Stock Photo
    Road through rural landscape, South Central Iceland, Iceland
    Illustration of the human brain with highlighted superior frontal gyri, also known as marginal gyri. It is located in the frontal lobe and is associated with self-awareness and laughter. — Stock Photo
    Illustration of the human brain with highlighted superior frontal gyri, also known as marginal gyri. It is located in the frontal lobe and is associated with self-awareness and laughter.
    Close-up view of cute little wild bird in natural background — Stock Photo
    Close-up view of cute little wild bird in natural background
    Human brain with highlighted superior temporal gyrus, illustration. It is involved in processing auditory information and encoding of memory. — Stock Photo
    Human brain with highlighted superior temporal gyrus, illustration. It is involved in processing auditory information and encoding of memory.
    Human brain with highlighted middle temporal gyrus, computer illustration. It is located in the temporal lobe and is involved in recognition of known faces and accessing word meaning while reading. — Stock Photo
    Human brain with highlighted middle temporal gyrus, computer illustration. It is located in the temporal lobe and is involved in recognition of known faces and accessing word meaning while reading.
    Low angle of modern multistory buildings located in New York on sunny day — Stock Photo
    Low angle of modern multistory buildings located in New York on sunny day
    Illustration of Nipah viruses binding to receptors on human cells, an initial stage of Nipah infection. Nipah virus is zoonotic (transmitted to humans from animals) and was first found in Malaysia and Singapore — Stock Photo
    Illustration of Nipah viruses binding to receptors on human cells, an initial stage of Nipah infection. Nipah virus is zoonotic (transmitted to humans from animals) and was first found in Malaysia and Singapore
    Human brain with highlighted precentral gyrus, computer illustration. It is located in the posterior frontal lobe and is the site of the primary motor cortex, the Brodmann area 4. — Stock Photo
    Human brain with highlighted precentral gyrus, computer illustration. It is located in the posterior frontal lobe and is the site of the primary motor cortex, the Brodmann area 4.
    Human brain with highlighted middle frontal gyrus, computer illustration. It is part of the prefrontal cortex of the frontal lobe. It is involved in language, learning and attention. — Stock Photo
    Human brain with highlighted middle frontal gyrus, computer illustration. It is part of the prefrontal cortex of the frontal lobe. It is involved in language, learning and attention.
    Illustration of Nipah viruses binding to receptors on human cells, an initial stage of Nipah infection. Nipah virus is zoonotic (transmitted to humans from animals) and was first found in Malaysia and Singapore — Stock Photo
    Illustration of Nipah viruses binding to receptors on human cells, an initial stage of Nipah infection. Nipah virus is zoonotic (transmitted to humans from animals) and was first found in Malaysia and Singapore
    Human brain with highlighted inferior frontal gyrus, computer illustration. It is a part of the prefrontal cortex and the location of Broca's area, which is involved in language processing and speech production. — Stock Photo
    Human brain with highlighted inferior frontal gyrus, computer illustration. It is a part of the prefrontal cortex and the location of Broca's area, which is involved in language processing and speech production.
    Back view of man with backpack standing on wet boulder and looking at amazing waterfall in rainforest in Costa Rica RELEASE — Stock Photo
    Back view of man with backpack standing on wet boulder and looking at amazing waterfall in rainforest in Costa Rica RELEASE
    Nipah virus particles, computer illustration. Nipah virus is zoonotic (transmitted to humans from animals) and was first found in Malaysia and Singapore in people who had close contact with pigs — Stock Photo
    Nipah virus particles, computer illustration. Nipah virus is zoonotic (transmitted to humans from animals) and was first found in Malaysia and Singapore in people who had close contact with pigs
    Human brain with highlighted precentral and postcentral gyri, computer illustration. The sites of primary motor (precentral gyrus) and somatosensory (postcentral gyrus) cortex. — Stock Photo
    Human brain with highlighted precentral and postcentral gyri, computer illustration. The sites of primary motor (precentral gyrus) and somatosensory (postcentral gyrus) cortex.
    Human brain with highlighted supramarginal gyrus, computer illustration. It is involved in perception of language, limb location, identifying postures and gestures of other people. — Stock Photo
    Human brain with highlighted supramarginal gyrus, computer illustration. It is involved in perception of language, limb location, identifying postures and gestures of other people.
    BUSAN - JUNE 21, 2018: Exterior of city street with glowing lights on Busan Cinema Center located in modern district — Stock Photo
    BUSAN - JUNE 21, 2018: Exterior of city street with glowing lights on Busan Cinema Center located in modern district
    Beautiful view of the sea. nature — Stock Photo
    Beautiful view of the sea. nature
    Buddha statue inside a stupa at Borobudur temple, Magelang, Central Java, Indonesia — Stock Photo
    Buddha statue inside a stupa at Borobudur temple, Magelang, Central Java, Indonesia
    Sunset over the Heavitree Range near Alice Springs, Central Australia, Northern Territory, Australia — Stock Photo
    Sunset over the Heavitree Range near Alice Springs, Central Australia, Northern Territory, Australia
    Nipah virus particles, computer illustration. Nipah virus is zoonotic (transmitted to humans from animals) and was first found in Malaysia and Singapore in people who had close contact with pigs — Stock Photo
    Nipah virus particles, computer illustration. Nipah virus is zoonotic (transmitted to humans from animals) and was first found in Malaysia and Singapore in people who had close contact with pigs
    South Korea - JUNE 28, 2018:Glowing Dongdaemun Design Plaza with bronze figure landmarks in central district of Seoul and popular tourist destinations — Stock Photo
    South Korea - JUNE 28, 2018:Glowing Dongdaemun Design Plaza with bronze figure landmarks in central district of Seoul and popular tourist destinations
    Wild Iceland horses, Southern Central Iceland, Iceland — Stock Photo
    Wild Iceland horses, Southern Central Iceland, Iceland
    Illustration of the human brain with highlighted superior frontal gyri, also known as marginal gyri. It is located in the frontal lobe and is associated with self-awareness and laughter. — Stock Photo
    Illustration of the human brain with highlighted superior frontal gyri, also known as marginal gyri. It is located in the frontal lobe and is associated with self-awareness and laughter.
    Aerial view of the beach with the waves of the sea. — Stock Photo
    Aerial view of the beach with the waves of the sea.
    Nipah virus particles, computer illustration. Nipah virus is zoonotic (transmitted to humans from animals) and was first found in Malaysia and Singapore in people who had close contact with pigs — Stock Photo
    Nipah virus particles, computer illustration. Nipah virus is zoonotic (transmitted to humans from animals) and was first found in Malaysia and Singapore in people who had close contact with pigs
    Human brain with highlighted supramarginal gyrus, computer illustration. It is involved in perception of language, limb location, identifying postures and gestures of other people. — Stock Photo
    Human brain with highlighted supramarginal gyrus, computer illustration. It is involved in perception of language, limb location, identifying postures and gestures of other people.
    Human brain with highlighted precentral and postcentral gyri, computer illustration. The sites of primary motor (precentral gyrus) and somatosensory (postcentral gyrus) cortex. — Stock Photo
    Human brain with highlighted precentral and postcentral gyri, computer illustration. The sites of primary motor (precentral gyrus) and somatosensory (postcentral gyrus) cortex.