Is your green my green? Probably not. What appears as pure green to me is likely to look a bit yellowish or bluish to you. This is because visual systems vary from person to person. Moreover, an ...
Dr. Mark Lindsay was 5 years old when he first learned that tree trunks were brown. "Up until that point, I believed leaves and trunks were all green. Just lighter and darker shades," Mark said. Mark ...
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