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The Mysterious Condition That Causes Painful Fat in Your Legs and Arms
Venus Is Putting on a Dazzling Show This Month
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The Push To Get Polluters To Pay For Nepal's Floods
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Your Neighborhood Could Influence Your Dementia Risk
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Do Planets Need Stars?
Do Planets Need Stars?
NIGHT SKY GUIDE

    9 Night Sky Events to See in September

    This month brings glowing planetary meetups, excellent Milky Way viewing, and the start of a promising season for northern lights.
    Test your knowledge

    Octopuses have a lot of secrets. Can you guess 8 of them?

    A master of disguise, cunning escape artist, and selfless parent, the octopus is an extraordinary creature. How well do you know them?

    Each tea has different effects: What's in your perfect cup?

    Nearly all tea comes from one plant, yet there are many varieties in color and effects. Build your own cup and discover which teas calm, energize, or even do both.

    How stressed are you? Answer these 10 questions to find out.

    This questionnaire—first developed by psychologists in 1983—is one of the most widely used stress perception assessment tools in the world.

    Design your own seashell

    Our interactive tool lets you harness the power of physics and math to coil, twist, and dilate a shell into whatever shape you can imagine—and then share your creation.
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