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Even as humanity reels beneath the assault of AIDS, epidemiologists are gearing themselves up for the plague's successor. It might be dengue fever, whose carrier, the Asian tiger mosquito, has recently appeared in the United States, or Creutzfeldt-Jakob disease, which has been transmitted by contaminated human growth hormone. The next pandemic might be caused by any of a dozen viruses that were once confined to other species or territories but now place human beings at risk as we increasingly cross...

One day Oscar sees a ball in the grass. "Try pushing it!" says Cricket. Oscar learns that the ball rolls slowly in grass and faster on a path, until it bounces off a tree and changes direction. Some things need a push to move, and others use their muscles to move themselves — and to move plenty of other things, too.

As Oscar the kitten watches the sun set one evening, he has lots of questions about light and dark. Who better than Moth to help out? Moth shows how sources of light are as different as the sun, stars, fireflies, streetlights, and airplanes, and also explains how shadows are made and why darkness comes at night. Includes lesson summaries!