Many of the questions children ask in the course of growing up can stump even the best educated adult: Why can't l tickle myself? Are we all rela

Author humorously answers civilization's most preplexing questions and darkest mysteries known to humankind.

Questions and answers introduce the biology, habitats, and behavior of aquatic animals, from luminous fish to fur seals.

Questions and answers explore the shape and structure of the Earth, continental drift and plate tectonics, earthquakes, volcanoes, oceans, and ot

Questions and answers explore various aspects of transportation, including railroads, automobiles, ships, aircraft, and special purpose vehicles.

"Millions of people visit xkcd.com each week to read Randall Munroe's iconic webcomic. His stick-figure drawings about science, technology, langu

Questions and answers introduce such physical phenomena as force, motion, magnetism, heat, and sound.