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Cygnus X-1 is the first black hole ever confirmed, discovered in 1971. It is part of a binary system, composed of a massive star and the black hole, with the black hole continuously pulling material f
Happy schoolgirl getting ready for first school day with help of her father at home.
Smiling young indian business man professional manager wearing suit looking at camera standing arms crossed in office. Arab teacher or professor posing for portrait at work desk in front of
CPR with mouth to mouth technique in a first aid course using a training dummy.
medical infographic demonstrating how to properly apply a tourniquet to stop severe bleeding, using clear step-by-step illustrations diagram hand drawn schematic raster. Medical science educational

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