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Part of the Hubble Ultra-Deep Field image showing a typical section of space containing galaxies int
Measurements of solar cycle variation during the last 30 years
Model of a sequential study in which two cohorts were followed beginning at age 20. One cohort was f
This portrait of Thomas Jefferson is considered an accurate likeness, painted when he was thirty-sev
The fact that a mother works outside the home has no negative effect on the well-being of her child ...
Doppler effect