By VanCleave, Janice
By VanCleave
By Osborne, Louise, Hodge, Deborah, Mason, Adrienne, Gold, Carol, Ontario Science Centre, Boudreau, Ray
By Hauser, Jill Frankel, Kline, Michael
By Bailey, Loren
By Claybourne, Anna
By Sara LaFleur
By Donna Latham, Illustrated by Jen Vaughn
By Scott, Marc, Marston, Mick
By Flynn, Mike
By Levine, Shar, Johnstone, Leslie, Harpster, Steve
By Granström, Brita, Manning, Mick
By Cherry, Lynne
By Anna Wilson, Elly Jahnz
By Johnson, M., etc.
By Weltman, Anna
By Robert Winston, Winston, Robert
By Donna Latham, Andrew Christensen
By Scientific American, Marc Rosner (Yonkers, New York)
By Andrew Haslam
By Joe Rhatigan, Heather Smith
By Dorling Kindersley, Parsons, Jayne
By Louise Spilsbury, Richard Spilsbury
By Bingham, Caroline
By Robert Winston
By E. Richard Churchill, Louis V. Loeschnig, Muriel Mandell, Frances Zweifel