In this folktale explaining why the sea has tides, and old woman threatens to pull the rock from the hold in the ocean floor. A wonderful 'just-so' story with a bonus ending explaining more than the title promises.--School Library Review.

In this folktale explaining why the sea has tides, an old woman threatens to pull the rock from the hole in the ocean floor if Sky Spirit does not honor his promise to give her shelter.

Wanting something in a busy world, whether it be of Sky Spirits or preoccupied parents, is a familiar situation. Marc Brown's drawing expand on this with warmth and strength as the feisty, dauntless old woman bargains with the Sky Spirit against the dramatic backdrop of the ocean swirling down and away forever.

Ebb and Flow was named one of 2007's "best science books" by Peter Calamai, science editor of the Toronto Star [Dec. 30, 2007]. He calls it a "wonderful resource book.... Tom Koppel seems to have visited or read about every place with unusual tides and water currents, yet he wears this scholarship lightly." Tides have shaped our world. They have carved out shorelines, transformed early life on Earth, and altered the course of human civilization. Tides frustrated Alexander the Great and Julius Caesar, and aided General MacArthur. They govern the way our planet moves, provide us with an alternative source of energy, and may be aggravating global climate change. Drawing on science, history, and personal memories, Koppel's fascinating book engages and enlightens, demonstrating that a subject we take for granted affects all our lives. He weaves together three grand narratives, exploring how tides impact coasts and marine life, how they have altered human history and development, and how science has striven to understand the surprisingly complex way in which tides actually work.

Adam Nicolson explores the marine life inhabiting seashore rockpools with a scientist’s curiosity and a poet’s wonder in this beautifully illustrated book. The sea is not made of water. Creatures are its genes. Look down as you crouch over the shallows and you will find a periwinkle or a prawn, a claw-displaying crab or a cluster of anemones ready to meet you. No need for binoculars or special stalking skills: go to the rocks and the living will say hello. Inside each rock pool tucked into one of the infinite crevices of the tidal coastline lies a rippling, silent, unknowable universe. Below the stillness of the surface course different currents of endless motion—the ebb and flow of the tide, the steady forward propulsion of the passage of time, and the tiny lifetimes of the rock pool’s creatures, all of which coalesce into the grand narrative of evolution. In Life Between the Tides, Adam Nicolson investigates one of the most revelatory habitats on earth. Under his microscope, we see a prawn’s head become a medieval helmet and a group of “winkles” transform into a Dickensian social scene, with mollusks munching on Stilton and glancing at their pocket watches. Or, rather, is a winkle more like Achilles, an ancient hero, throwing himself toward death for the sake of glory? For Nicolson, who writes “with scientific rigor and a poet’s sense of wonder” (The American Scholar), the world of the rock pools is infinite and as intricate as our own. As Nicolson journeys between the tides, both in the pools he builds along the coast of Scotland and through the timeline of scientific discovery, he is accompanied by great thinkers—no one can escape the pull of the sea. We meet Virginia Woolf and her Waves; a young T. S. Eliot peering into his own rock pool in Massachusetts; even Nicolson’s father-in-law, a classical scholar who would hunt for amethysts along the shoreline, his mind on Heraclitus and the other philosophers of ancient Greece. And, of course, scientists populate the pages; not only their discoveries, but also their doubts and errors, their moments of quiet observation and their thrilling realizations. Everything is within the rock pools, where you can look beyond your own reflection and find the miraculous an inch beneath your nose. “The soul wants to be wet,” Heraclitus said in Ephesus twenty-five hundred years ago. This marvelous book demonstrates why it is so. Includes Color and Black-and-White Photographs