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San Diego, California, USA - March 21, 2011: A close-up of the Wikipedia homepage (www.wikipedia.org) shown in a Firefox web browser. Wikipedia is a collaborative online encyclopedia created by volunteers with articles in over 279 different languages, of which the most widely used are demonstrated here on its homepage.
geometry drawing on page of old yellow book as background, algebra book as background
European businessman measuring salary.
A worker is checking on the hazardous chemical material information form with background of chemical storage area at the factory place. Industrial safety working action. Selective focus.
Pen on the results of a blood count
passed inspection check list
Chemistry ideas. Light bulb silhouettes and book with chemical formulas. 3D rendering.
blue bubble with h2 text
Stop dangerous PFAS per-and polyfluoroalkyl substances used in products and materials due to their enhanced water-resistant properties - Concept with hand erasing
Europe city break. Local coffee shop in Portugal.
Blank cheque with fake numbers with blue pattern background.
Return Rail ticket to Huntingdon from London
Caucasian chemistry teacher pointing at periodic table on wall chart. The dutch chemist is standing in a classroom of an european high school. School pupils have to learn all the different elements and atoms. They need this knowledge for their future jobs in science when they work in a laboratory.
A kindergarten progress report card from the 1987 - 1988 school year. Social habits.
blank customs declaration label on a foreign packet parcel isolated over white background
An open daily calendar with a yellow sticky note reminder of  the beginning of Autumn
Paid medical bill for a cardiac CT scan and a number of drugs.  - See lightbox for more
Thursday, November 28th on the calendar
Optical birefringence demonstrated using a text using a natural double spar / calcite crystal, macro shot and with real shadows
ISO 9001 Quality Management System Certified Concept
Close up of a senior woman hand medical history questionnaire
Close up a dilution ratio label of concentrated liquid chemicals on plastic bottles, human hand holding a plastic bottles for liquid chemicals.
Two old inoculation certificates from the 1970s.
Engineer plane document paper fold detail
Healthy living shopping receipt. Isolated on white
printout of data from a seismic test for an oil well
glasses on project.
capillary columns of various lengths for gas chromatographic analysis and chromatogram samples. equipment for analytical chemistry in the laboratory. close-up, selective focus
Network security internet cyber protection fingerprint biometrics
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