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wikipedia.org
https://en.wikipedia.org/wiki/Blue
Blue - Wikipedia
Darker shades of blue include ultramarine, cobalt blue, navy blue, and Prussian blue; while lighter tints include sky blue, azure, and Egyptian blue (for a more complete list see the List of colours).
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harvard.edu
https://www.health.harvard.edu/diseases-and-condit…
What to know about methylene blue - Harvard Health
Once used to treat malaria, methylene blue is gaining attention for a range of health-related uses. Learn where it started, how it works, and what the evidence says about its safety and benefits....
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britannica.com
https://www.britannica.com/science/blue-color
Blue | Description, Etymology, & Facts | Britannica
Blue is a basic colour term added to languages after black, white, red, yellow, and green. The term blue derives from Proto-Germanic blæwaz and Old French blo or bleu.
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merriam-webster.com
https://www.merriam-webster.com/dictionary/blue
BLUE Definition & Meaning - Merriam-Webster
The meaning of BLUE is of the color whose hue is that of the clear sky : of the color blue. How to use blue in a sentence.
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colorpsychology.org
https://www.colorpsychology.org/blue/
The Meaning and Psychology of Blue in Life & Design
Blue, a color that commands a unique position in the color spectrum, has permeated various aspects of our lives, imbuing them with profound meanings and emotions. As the color of the sky and sea, it has been a ceaseless source of inspiration and symbolism throughout history and across cultures.
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dictionary.com
https://www.dictionary.com/browse/blue
BLUE Definition & Meaning | Dictionary.com
BLUE definition: the pure color of a clear sky; the primary color between green and violet in the visible spectrum, an effect of light with a wavelength between 450 and 500 nanometers. See examples of blue used in a sentence.
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verywellmind.com
https://www.verywellmind.com/the-color-psychology-…
The Color Blue: Meaning, Color Psychology, Effects - Verywell Mind
The color blue is associated with feelings of calm and relaxation. Learn about blue's other meanings and its role in color psychology, as well as our feelings and behaviors.
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cambridge.org
https://dictionary.cambridge.org/dictionary/englis…
BLUE | English meaning - Cambridge Dictionary
BLUE definition: 1. of the colour of the sky without clouds on a bright day, or a darker or lighter type of this…. Learn more.
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collinsdictionary.com
https://www.collinsdictionary.com/us/dictionary/en…
BLUE definition in American English | Collins English Dictionary
If you are feeling blue, you are feeling sad or depressed, often when there is no particular reason.
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npr.org
https://www.npr.org/2025/12/15/nx-s1-5634680/methy…
Methylene blue is popular on TikTok. What's behind the claims? : NPR
Taking drops of a medical dye is trending in wellness and biohacking circles. Some influencers claim it boosts longevity and brain health. Scientists say the hype has gotten ahead of the research.