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From Earth Science Information Partners (ESIP)
- particles from burning vegetation and man-made structures. Smoke can harm the eyes, irritate the respiratory system, and worsen chronic heart and lung diseases14 KB (1,719 words) - 11:22, December 4, 2021
- shown that humans do not perceive more than 6 depths at one time. Humans eyes are rarely of the same strength and contributes to depth perception problems18 KB (2,174 words) - 13:31, July 26, 2011