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Early in the twentieth century, when malnutrition was common, companies such as this one advertised
Older people who exercise cognitive skills, like these chess players, retain those skills well into ...
Notice the reddish-brown haze caused by nitrogen oxides that is often over many major cities.
People with normal color vision see the number 29 in the chart; however, those who are color-blind c
Collage of people showing emotions
Survivorship curves for people in the United States in the early 20th and early 21st centuries