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Requena

Spain

Cluster Analysis

statistics

Palomar Observatory

observatory, California

Solar System

Planets, Diagram, Videos, & Facts

Copperbelt

region, Africa

Nightglow

meteorology

Franklin, Rosalind

Biography, Facts, & DNA

Kittery

Maine

Sedgwick, Adam

British geologist

Jacobi, Carl

German mathematician

Johnston, Henrietta

American artist

Chorrillos

Peru

Hsin-ying

Taiwan

Angra Dos Reis

Brazil

Kansk

Russia

Kimhi, David

European scholar