Wal Thornhill got his degree in physics from Melbourne University. He says that much of his inspiration came from Immanuel Velikovsky’s book, Worlds in Collision. Wal was invited to attend one of Velikovsky’s conferences in Ontario in 1974, and he began to question the nature of gravity. His ideas have sparked the interest of scientists, engineers, and astronomers, and I expect that they will pique the interest of our listeners, as well. Enjoy!