Scientist removes cell growth medium from a 6–well plate in preparation for a plaque assay, which is a test that allows… Free Image from public domain license 
Lab technician adding a solution to an Enzyme–Linked Immunosorbent Assay (ELISA) plate Original image sourced from US… Free Image from public domain license 
Test Tubes from experimenting on coronavirus. Original image sourced from US Government department: Public Health Image… Free Image from public domain license 
Health officials inspecting specimens suspected of being connected to a hantavirus outbreak. Original image sourced from US… Free Image from public domain license 
Scientist testing with virus through test tubes. Original image sourced from US Government department: Public Health Image… Free Image from public domain license 
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Microbiologist preparing for antibody testing. A healthcare provider donning a pair of green latex gloves in order to protect… Free Image from public domain license 
Test Tubes from experimenting on coronavirus. Original image sourced from US Government department: Public Health Image… Free Image from public domain license 
A scientist holding bacterial samples for their antimicrobial susceptibility. Original image sourced from US Government… Free Image from public domain license 
A scientist examining the results of a hemagglutinin inhibition (HI) test. Original image sourced from US Government… Free Image from public domain license 
Four test tubes of bacterial microorganism. Original image sourced from US Government department: Public Health Image… Free Image from public domain license 
Scientist testing with virus through test tubes. A healthcare provider donning a pair of green latex gloves in order to… Free Image from public domain license 
Scientist testing with coronavirus through test tubes. Original image sourced from US Government department: Public Health… Free Image from public domain license 
A scientist implementing molecular testing. Original image sourced from US Government department: Public Health Image… Free Image from public domain license 
Sample of test tubes. A healthcare provider donning a pair of green latex gloves in order to protect herself during her… Free Image from public domain license 
Seeds are secured in plant pillows for the Veggie plant growth system inside a laboratory in the Space Station Processing… Free Image from public domain license 
Sample of test tubes. A healthcare provider donning a pair of green latex gloves in order to protect herself during her… Free Image from public domain license 
Photograph of MSC-8 color patch outside spacecraft during docking. Original from NASA. Digitally enhanced by rawpixel. Free Image from public domain license 
Front 3/4 view of the Avrocar. Original from NASA. Digitally enhanced by rawpixel. Free Image from public domain license 
On the top deck of the USS San Diego, U.S. Navy personnel monitor a helicopter landing after an Orion underway recovery test.… Free Image from public domain license 
The second free-flight test of an evolving series of X-38 prototypes took place July 10, 2001 when the X-38 was released from… Free Image from public domain license 
ATK Solar Array Deployment Test at NASA Plum Brook Station Space Power Facility. Original from NASA. Digitally enhanced by… Free Image from public domain license 
A scientist implementing molecular testing. Original image sourced from US Government department: Public Health Image… Free Image from public domain license 
Female clinician in the process of conducting a blood pressure examination on a patient. Original image sourced from US… Free Image from public domain license 
Controlled Impact Demonstration instrumented test dummies installed in plane. Original from NASA. Digitally enhanced by… Free Image from public domain license 
Scientist testing with virus through test tubes. Original image sourced from US Government department: Public Health Image… Free Image from public domain license 
Laboratory technician working with a cell culture solution, using a syringe to add some of the sample to a glass bottle.… Free Image from public domain license 
A scientist adding a stool sample to the cell culture medium, along with glass beads. Original image sourced from US… Free Image from public domain license 
Three test tubes used in a Legionella pneumophila bacteria detection test. Original image sourced from US Government… Free Image from public domain license 
This photograph shows the Vehicle System Test Bed rover, a nearly identical copy to NASA's Curiosity rover on Mars. Original… Free Image from public domain license 
A scientist working with samples to be tested using a real time PCR machine. Original image sourced from US Government… Free Image from public domain license 
STS-131 NASA & Walter Reed Hospital Tissue Growth Experiments - Flight Preps. Original from NASA . Digitally enhanced by… Free Image from public domain license 
Laboratory technician working with electronic cigarettes. Original image sourced from US Government department: Public Health… Free Image from public domain license 
Scientist analyzing samples from industrial hygiene investigations. Original image sourced from US Government department:… Free Image from public domain license 
A scientist examining the results of a hemagglutinin inhibition (HI) test. Original image sourced from US Government… Free Image from public domain license 
A test tube tray containing a number of purple tipped vacutainer tubes. Original image sourced from US Government department:… Free Image from public domain license 
Laboratory technician working with a cell culture solution, using a syringe to add some of the sample to a glass bottle. A… Free Image from public domain license 
An American flag flies at Space Launch Complex-2 at Vandenberg AFB, California. Original from NASA. Digitally enhanced by… Free Image from public domain license 
Arabidopsis seeds are being planted in Veggie Passive Orbital Nutrient Delivery System (PONDS) units inside a laboratory at… Free Image from public domain license 
Local health centers experimenting with coronavirus. Original image sourced from US Government department: Public Health… Free Image from public domain license 
A scientist holding up a glass slide. Original image sourced from US Government department: Public Health Image Library… Free Image from public domain license 
Two laboratory technicians experimenting with virus. Original image sourced from US Government department: Public Health… Free Image from public domain license 
Inside NASA's giant thermal vacuum chamber, called Chamber A, at NASA's Johnson Space Center in Houston, the James Webb Space… Free Image from public domain license 
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Operators test the National Aeronautics and Space Administration’s Plum Brook Reactor Facility systems. Original from… Free Image from public domain license 
This photograph shows the Vehicle System Test Bed rover, a nearly identical copy to NASA's Curiosity rover on Mars. Original… Free Image from public domain license 
Nighttime, ground level view of Pad A, Launch Complex 39, Kennedy Space Center, showing the Apollo 13. Original from NASA.… Free Image from public domain license 
Test Package Plummets in the Zero Gravity Research Facility at Lewis Research Center, NASA. Original from NASA. Digitally… Free Image from public domain license 
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Kennedy Space Center in Florida participate in a training exercise at the Shuttle Landing Facility. Original from NASA .… Free Image from public domain license 
Launch of Friendship 7 with astronaut John Glenn aboard. Original from NASA. Digitally enhanced by rawpixel. Free Image from public domain license 
On the top deck of the USS San Diego, U.S. Navy personnel monitor a helicopter landing. Original from NASA. Digitally… Free Image from public domain license 
An H60-S helicopter takes off from the deck of the USS Anchorage during the first day of Orion Underway Recovery Test 3… Free Image from public domain license 
The Bell X-14 NASA 704 Full Scale Airplane tests in 40x80ft. Wind Tunnel (NORMAL MOUNTING) with Sy Sewell, NASA (left) and Ed… Free Image from public domain license 
Scientists using automated methods to extract bacterial DNA, for use in whole genome sequencing (WGS). Original image sourced… Free Image from public domain license 
Scientist pipetting samples of bronchoalveolar lavage (BAL) fluid. Original image sourced from US Government department:… Free Image from public domain license 
International Flavors and Fragrances Inc., is a company that creates and manufactures flavors, fragrances and aroma… Free Image from public domain license 
Olivine on Earth. Oct 30th, 2012. Original from NASA. Digitally enhanced by rawpixel. Free Image from public domain license 
NASA Glenn's new LED solar simulator was developed by Angstrom Designs and UC Santa Barbara to test the next generation of… Free Image from public domain license 
A scientist testing a sample suspected of containing a bacterial toxin. Original image sourced from US Government department:… Free Image from public domain license 
Light Microscopy Microscope Experiment. The particles in the tube glow orange because they have been fluorescently tagged… Free Image from public domain license 
At the Astrotech facility in Titusville, Fla., technicians perform backlight inspection and cleaning on NASA's Lunar… Free Image from public domain license 
A view inside the 55-foot high containment vessel of the National Aeronautics and Space Administration (NASA) Plum Brook… Free Image from public domain license 
Inflation Tests of the Echo 1 Satellite in Weeksville, N.C. Original from NASA . Digitally enhanced by rawpixel. Free Image from public domain license 
Tomato plants are growing under red and blue LED lights in a growth chamber inside a laboratory at the Space Station… Free Image from public domain license 
Four Engine USB Model in the 40x80 foot Wind Tunnel. Large-Scale Upper-Surface Blowing Model using JT15D Engines. Test #441… Free Image from public domain license 
NASA's SOFIA airborne observatory lands at Edwards AFB. Original from NASA. Digitally enhanced by rawpixel. Free Image from public domain license 
This grouping of two test rovers and a flight spare provides a graphic comparison of three generations of Mars rovers… Free Image from public domain license 
A close-up view of the Orion crew module from Exploration Flight Test 1 on display at nearby NASA Kennedy Space Center… Free Image from public domain license 
APOLLO XII - countdown demonstration test (CDDT). Original from NASA. Digitally enhanced by rawpixel. Free Image from public domain license 
X-15A-2 in flight. First flight with dummy ramjet attached, at 8 May 1967. Original from NASA. Digitally enhanced by… Free Image from public domain license 
Tomato plants are growing inside a laboratory at the Space Station Processing Facility at NASA’s Kennedy Space Center… Free Image from public domain license 
Inside the Spectrum prototype unit, organisms in a Petri plate are exposed to blue excitation lighting. Original from NASA.… Free Image from public domain license 
Boundary Layer Ingestion. Original from NASA. Digitally enhanced by rawpixel. Free Image from public domain license 
The Fuel Burner Rig is a test laboratory at NASA Glenn. These samples face 200-mile per hour flames to simulate the… Free Image from public domain license 
The launch of the Mercury-Redstone 3 spacecraft from Cape Canaveral on a suborbital mission, 5 May 1961. Original from NASA.… Free Image from public domain license 
Space Shuttle Solid Rocket Booster Drop Test Vehicle (SRB-DTV) captive flight on NB-52B. Original from NASA. Digitally… Free Image from public domain license 
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The KSC response team practices lifting an injured crew member to an Air Force HH-60 helicopter for transport to a local… Free Image from public domain license 
The launch gantry is rolled back to reveal NASA's Orion spacecraft mounted atop a United Launch Alliance Delta IV Heavy… Free Image from public domain license 
The mockup Orion crew exploration vehicle floats in the water at the Trident Basin at Port Canaveral, Fla. Apr 8th, 2009.… Free Image from public domain license 
he SpaceX Falcon 9 rocket makes its way to the pad at Space Launch Complex-40 on Cape Canaveral Air Force Station in Florida.… Free Image from public domain license 
Testing autonomous software for AARD program using a NASA F/A-18 #845 following a chartered Sabreliner, June 27th, 2006.… Free Image from public domain license 
A scientist testing bacterial samples for their antimicrobial susceptibility. Original image sourced from US Government… Free Image from public domain license 
Test Tubes from experimenting on coronavirus. Original image sourced from US Government department: Public Health Image… Free Image from public domain license 
Eggs in salted water and in pure water from Six Weeks Of Vacation (1880) published by Paul Poiré. Original from the British… Free Image from public domain license 
Illustration by an American engineer and inventor, Robert Fulton (1765-1815), of submarine vessel under sail and anchored for… Free Image from public domain license 
Laboratory technicians working together. Original image sourced from US Government department: Public Health Image Library… Free Image from public domain license 
A field epidemiologist performing a mouth swab inside the beak of a white duck, in order to carry out an infectious disease… Free Image from public domain license 
A technician placing the repackaged influenza samples into a cold–storage environment within the laboratory setting.… Free Image from public domain license 
Laboratory technicians working in health lab. Original image sourced from US Government department: Public Health Image… Free Image from public domain license 
A 1125X photomicrograph magnification of Giemsa stained blood smear, revealed a number of Plasmodium falciparum parasites, in… Free Image from public domain license 
Penned cattle undergoing an inspection for signs of central nervous system disorders. Original image sourced from US… Free Image from public domain license 
A scientist holding up a glass slide used for a run on a sequencing machine. Original image sourced from US Government… Free Image from public domain license 
A 1125X photomicrograph magnification of a Giemsa stained, thin film blood smear, revealed a mature, Plasmodium malariae… Free Image from public domain license 
Echo Satellite. Original from NASA. Digitally enhanced by rawpixel. Free Image from public domain license 
A scientist using a whole genome DNA sequencer, in order to determine the “DNA fingerprint” of a specific… Free Image from public domain license 
Influenza virus experimentation with eggs. Original image sourced from US Government department: Public Health Image Library… Free Image from public domain license 
A scientist preparing samples for mass spectrometry in order to determine the presence of a bacterial toxin. Original image… Free Image from public domain license