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What Is a Light-Year?

Do you know what it is that a light-year actually measures? Do you know why so many people find it confusing? And why they really shouldn’t?

4 hours ago — Math Dude Jason Marshall

Walking Sharks at Risk

New research reveals that the distributions for these nine striking species are much smaller than we previously assumed

21 hours ago — John R. Platt

BLACK FRIDAY & CYBER MONDAY BLOWOUT SALE

For a limited time, GET 20% OFF SITEWIDE!