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Close up head shot confident serious concentrated young man looking at camera studio portrait, isolated on grey white studio background. Thoughtful millennial guy posing for album photo.
A doctor or nurse is caring for a patient with respiratory problems. A portable oxygen concentrator or other type of oxygen generator.
Nurse in retirement home helping old male patient with board game. Senior man with cognitive disorder sitting at table in geriatric clinic, playing games and thinking. Dementia, Alzheimers, care
Background with patterned concentration lines and pop frame, pop design
The sun and magnifying glass experiment focuses sunlight to a point, demonstrating how lenses concentrate energy to ignite or heat objects.

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