Nine contributors tackle questions about the nature of memory and forgiveness after the Holocaust. This book - created out of shared concerns about forgiveness, reconciliation, and justice, and out of a desire to investigate differences between religious traditions - represents an effort to spark meaningful dialogue between Jews and Christians and to encourage others to participate in similar inter- and intrafaith inquiries.

SONAR (sound navigation and ranging) systems have many similarities to RADAR and electro-optical systems. Again, detection is based on the propagation of waves between the target and detector. There are active sonar systems, where the wave propagates from the transmitter to the target and back to the receiver, analogous to pulse-echo radar. There are also passive sonar systems, where the target is the source of the energy which propagates to the receiver, analogous to passive infrared detection. Therefore, a great deal of what has been discussed about these systems will also apply to sonar. Sonar, however, differs fundamentally from radar and electro-optics because the energy is transferred by acoustics waves propagating in water. So we first begin by discussing the characteristics of acoustic waves.

Includes extra sessions.

A lonely astronaut stumbles upon a disaster in the making: the Earth will be turned into a crater-pocked ruin and millions of people will be killed, unless she can convince someone to take preventive action. But she has a huge problem. After all, who would believe an ordinary young woman who said such a thing, especially if there is no record she is an astronaut and especially not if she also claims to have come from a different solar system? Only the U. S. government does, and hunts her with all the forces it can muster. Terrified and with few resources, she tries desperately to disprove people's low opinion of what a young woman is capable of. And what about her earthly boy friend? Would he believe her, or sell her out?