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6-8 Science
Scholar (Ages 13-18)
Natural Selection and Evolution
The mechanism that explains the diversity of every living thing — and the evidence, from fossils to DNA, that lets us see it happening.
15 min
+15 XP
Space Science — Stars and Galaxies
Our sun is just one of 400 billion stars in our galaxy — and there are hundreds of billions of galaxies out there. Let's zoom out.
15 min
+15 XP