- May 6, 2008 • 8:56 pm PDT
- + responses
Sperm can live 3 or more days in a woman's reproductive system. Theoretically a woman could have unprotected sex on Saturday, ovulate on Sunday, and become impregnated on Monday!
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What Does Teaching Creativity Look Like?
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Most Americans Want a Walkable Neighborhood, Not a Big House
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This Valentine's Day, Celebrate All Kinds of Love
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Don't Reinvent The Wheel, Steal It: An Urban Planning Award for Cities That Copy
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Birth Control Costs More Than You Think—Even for the Lucky Ones
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Most Americans Want a Walkable Neighborhood, Not a Big House
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Give Komen the Pink Slip: Five Ways to Support Women's Health for All
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Is Sweden's Classroom-Free School the Future of Learning?
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What Would a Post-SOPA Internet Look Like?
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A 375-Year-Old French Bank Forgives Debts of Paris' Poorest
today's top stories from our friends at pitchfork
Remembering Pearl Harbor..
Why we should pass the climate legislation that's right for America, not easy for the Senate. If there's any Democrat in Congress who never...

Factors like internet use and emotional health might be more likely to indicate whether a student will graduate.

Teens are mad about the store's policy of spraying itself silly with a signature scent, called "Fierce." Is scenting public places ethical?

Toilet taboos are literally killing people around the world. So find an artsy/activist event in your neighborhood to save lives with potty talk.
Writing for WSJ, Alex Tabarrok explores a number of innovative solutions to the organ shortage, ranging from a system of "presumed consent,"...

When it comes to vaccines, we've already seen that they've made a huge difference in saving child lives.
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One company's ambitious plan to change the energy economy of sub-Saharan Africa, saving lives and the environment.

“A year ago, yes, it was a guess, it was a risk, today it’s not.”
Interesting piece came out this week about Masdar City, that still-imaginary suburb of Abu Dhabi that is being built as a zero-carbon,...

Harrowing photos emerge from inside Japan's nuclear terror.

For October's challenge, we're asking you to get healthy, from your feet to your teeth to your brain.

Will urban agriculture become a major part of the food system in San Francisco?
April 5 is a "Day Without Shoes." Will you go barefoot for change? To help kids in the developing world get footwear?

Some craft brewers are ditching bottles for cans and clapping their hands. Should we all be applauding the move?

We've teamed up with NeighborGoods to help anyone share tools for this weekend's massive river clean-up, taking place at 14 locations in the city.

