Our X and Y chromosomes make an odd couple. The X resembles any other chromosome, but the Y—the source of maleness—is downright strange. How did the two come to differ so much?
Salespeople, politicians, friends and family all have a stake in getting you to agree to their requests. Social psychology has determined the basic principles that govern getting to "yes"
Full-spectrum light-emitting diodes, or LEDs, are becoming widespread—and the race is on to develop white-light versions to replace Edison's century-old incandescent bulb
We drink it, we generate electricity with it, we soak our crops with it. And we're stretching our supplies to the breaking point. Will we have enough clean water to satisfy the world's needs?
If the world hopes to feed its burgeoning population, irrigation must become less wasteful and more widespread
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