"Juan Diego -- a fourteen-year-old boy, who was born and grew up in Mexico -- has a thirteen-year-old sister. Her name is Lupe, and she thinks she sees what's coming -- specifically, her own future and her brother's. Lupe is a mind reader; she doesn't know what everyone is thinking, but she knows what most people are thinking. Regarding what has happened, as opposed to what will, Lupe is usually right about the past; without your telling her, she...

"A monumental work on the flow of time, from the universe's creation to "Now," by the best-selling author of Physics for Future Presidents. "Now" is a simple concept--you're reading this sentence now. Yet a real definition of "now" has eluded even the great Einstein. We know that time stretches and is affected by gravity and velocity. Yet, as eminent physicist Richard A. Muller points out, it is only today that we have all the physics at hand--relativity,...

When a spaceship lands in the small town of Vern Hollow in 1956, juvenile delinquent Jack Creedle and prim, studious Isadora Shumway form an unexpected alliance as they try to keep a group of extraterrestrials from stealing eccentric Uncle Bud's space travel machine.

Having used their magic tree house to travel to India, where they must get a gift to help free the dog Teddy from a spell, Jack and Annie have adventures involving a tiger and other endangered jungle animals.

Eevee, an aspiring artist and daughter of Arizona's governor, and Danny, a reformed troublemaker who lives in foster care in his own world, join forces to correct a breach between parallel universes.

When his fairy friends help him travel back in time to save the African lemur from extinction, teenaged Artemis Fowl must face his deadliest foe yet--his younger self.

While spending the summer in a house by the sea, four cousins, Roger, Ann, Eliza, and Jack, discover a bank of wild thyme whose magic propels them on a series of adventures back and forth through time.

When the Time Fetch's foragers gobble up too much time, causing the fabric of the universe to unravel and blur the boundaries between worlds and dimensions, eighth-grade loner Edward and his classmates must band together to save the day.