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Many will remember the segment of "The Sorcerer's Apprentice" in the Disney film Fantasia; it is a perfect metaphor for medical imaging as it stands today. The apprentice magician tests his nascent skills at sorcery by bringing common household items to life and putting them to work. At first, things go well, but eventually he loses control, and chaos ensues.

Medical imaging, too, could spin out of control. The benefits of imaging are undeniable. In the past thirty years, innovations like CT, MRI, and PET scanning have not only markedly reduced clinical risk for patients but have...

It's tough to be Zeke.

He's got his hands full with his prissy, know-it-all sister; his mean cousin Caitlyn, who's house-sitting for his missing parents; and a bully making life tough at school. And now, thanks to a stinky, scruffy, good-for-nothing talking cat, he's also got to cope with zombies, midget freedom fighters, devious spies, superstar rappers, and a whole weird world beneath our own where people wear their underwear on the outside of their clothes.

Sometimes even sidekicks have to step up.

Zeke's busy being the so-called Prince of Underwhere. His prissy sister, Stephanie, is some sort of pirate queen. But Hector? He's just a sidekick. Well, those days are over. Now only Hector can save the day--if he can survive swarms of sharp-beaked midget dinos, smart-aleck flying horses, angry armies in their undies, a really, really bad hypnotist, and a duel with deadly toilet plungers. . . all the ordinary wedgie weirdness of the tighty-whitie world under our own.

Stephanie has a whole underwear drawer full of trouble.

A week ago, Stephanie's biggest problem was finding enough time to complete her homework and study for her Mathletes competitions. Now she has to deal with magical toilet brushes, sinister talking cats, nearsighted sea serpents, feminist pirates, runty freedom fighters, and all the cottony white weirdness of Underwhere--the world beneath our own where people wear their undies on the outside of their clothes.

By the end of World War I, Albert Einstein had become the face of the new science of theoretical physics and had made some powerful enemies. One of those enemies, Nobel Prize winner Philipp Lenard, spent a career trying to discredit him. Their story of conflict, pitting Germany's most widely celebrated Jew against the Nazi scientist who was to become Hitler's chief advisor on physics, had an impact far exceeding what the scientific community felt at the time. Indeed, their mutual antagonism affected the direction of science long after 1933, when Einstein took flight to America and changed the...