effect of light on

"A map made of stars guides the sparrows way. . . . When they reach the city, light pollution masks the map and confuses the birds. One sparrow becomes seperated from the flock. A girl rescues the lost sparrow and decides to take action. She rallies a group of friends, and together they encourage people all over the city to help the sparrows. . . . Will the city be ready by the time the flock returns?"--Provided by publisher.

[Describes] why there is night, why we dream, why some creatures are most active at night, whether plants sleep, why stars twinkle in the night sky, and more"--Provided by publisher.

Explains how all life on Earth depends, directly or indirectly, on light from the sun, and how all ocean life, from the tiniest plankton to great whales, including the creatures in the darkest depths, form a web that uses sunshine.

Explains how plants make food to nourish themselves, and discusses the importance of sunlight to the process. Includes a glossary and resources for further research.