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  • How Kin Selection Works

    How Kin Selection Works

    We're used to taking the phrase "survival of the fittest" to mean it's an "every man for himself" world. But some animals (like worker bees) sacrifice themselves to ensure their species lives on. Why would they do this?

  • Invasive Species and Extinction

    Have invasive species caused any extinctions?

    Introducing a new species into an ecosystem can have unforeseen and disastrous consequences for the species that already live there.

  • Farmers' Almanac and Weather Predictions

    How does the Farmers' Almanac predict weather?

    It sure would be handy to know what the weather is going to be like for the next year. Unfortunately, there's just one problem: Weather is notoriously difficult to predict. So is the Farmers' Almanac accurate, or is it just blowing hot air?

  • Science Puzzles

    Science Puzzles: Studying DNA

    From beneath the Earth's crust to the farthest reaches of outer space, explore your world as you piece together these science puzzles.

  • How Kin Selection Works
  • Invasive Species and Extinction
  • Farmers' Almanac and Weather Predictions
  • Science Puzzles
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How Rainbows Work

Rainbows are one of nature's most beautiful effects. Have you ever wondered how the colors end up in seemingly perfect bands? And, what about double rainbows -- how does that happen? Find out how rain and sun can align to put color in the sky.

Has Earth reached its carrying capacity?

When Thomas Malthus warned that the human population would eventually outpace Earth's resources, he wasn't anticipating the green revolution. So why do rising food costs have some folks worried we're running at capacity?

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