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Whale shark under water. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3305703/free-photo-image-animal-animals-images-pictures-bubbleFree Image from public domain license
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Icy bubble on a pine branch. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3284247/free-photo-image-turtle-botanical-abiesFree Image from public domain license
Sunglass at the top of the mountain. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3285482/free-photo-image-blue-sky-bubble-cc0Free Image from public domain license
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This hemispherical window was designed to cover the camera ports inside Argonne Lab's 12-foot (diameter) hydrogen bubble… https://www.rawpixel.com/image/3325630/free-photo-image-black-white-aec-argonne-labFree Image from public domain license
Nursery school. A little girl and a little boy are blowing bubbles. Original public domain image from Flickr https://www.rawpixel.com/image/8763764/photo-image-bubbles-girlFree Image from public domain license
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Proton with 300 GeV energy producing 26 charged particles in the 30 inch hydrogen bubble chamber at FERMILAB, c.1973.… https://www.rawpixel.com/image/3322287/free-photo-image-cc0-creative-commonsFree Image from public domain license
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