Since prehistoric times, people have wondered how the universe works. Early scientists studied how forces affect objects and watched how heavenly bodies move. In 1687 Isaac Newton published a set of laws that described the motion of all objects, both on Earth and in the heavens. By 1900 many physicists believed only a few questions remained to be answered. But the early 1900s brought revolutionary developments in physics. One was Albert Einstein's...

Relates the stories of a number of famous UFO sightings, including the purported crash of an alien spaceship in Roswell, New Mexico, in 1947.

Investigates several well-known accounts of alien abduction as well as theories aimed at explaining why such reports cannot be true.

Examines and explains several mysteries surrounding death and dying, including spontaneous human combustion, remembering past lives, ghosts, and near-death experiences.

Rhyming text and illustrations featuring clock faces follow the animals and activities on Farmer Fred's farm.

Explores such unexplained human phenomena as hypnosis, spontaneous human combustion, and extrasensory perception.

Examines the amazing world of animals, from the feats of ordinary dogs to unproved monsters in the wild.

Rhyming text teaches young children how to tie a shoe.