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In 1964, Mississippi civil rights groups banded together to fight Jim Crow laws in a state where only 6.4 percent of eligible black voters were registered. Testing a bold new strategy, they recruited students from across the United States. That summer these young volunteers defied segregation by living with local black hosts, opening Freedom Schools to educate disenfranchised adults and their children, and canvassing door-to-door to register voters.

It's 1793, and there's an invisible killer roaming the streets of Philadelphia. The city's residents are fleeing in fear. This killer has a name—yellow fever—but everything else about it is a mystery. Its cause is unknown, and there is no cure.

Parvana felt the shadow before she saw it, as the man moved between her and the sun. Turning her head, she saw the dark turban that was the uniform of the Taliban. A rifle was slung across his chest as casually as her father's shoulder bag had been slung across hers...

The Talib kept looking down at her. Then he put his hand inside his vest. Keeping his eyes on Parvana, he drew something out of his vest pocket.

Parvana was about to squish her eyes shut and wait to be shot when she saw that the Talib had taken out a letter.

He sat down beside her on the blanket.

They have a touch so feather-light, it can barely be felt on human skin. The vividly gold and black colored golden orb weaver spider is the largest web-making spider on the planet. These elegant and efficient arachnids can weave impressive webs up to three feet wide in less than an hour. And these spiders' silk-spinning abilities could have far-reaching implications for science and medicine.