图片说明

The copyrighted DC Comics，Marvel Comics，Gold Key Comics，Tribune Media Syndicate，King Features Syndicate，Experimenter Publishing，Stellar Publishing，Teck Publishing，and Dille Family Trust illustrations in this book are reproduced for commentary，critical，scientific，and scholarly purposes.The copyright information and dates adjacent to the illustrations refer to when the illustrations were first published.

All line drawings copyright James Kakalios and Christopher Jones.

Figure 21：Photograph by Alan Richards，courtesy of AlP Emilio Segre Visual Archives.

Figure 25：Data from Figure 1 from"The Natural Distribution of Tritium，"Sheldon Kaufman and W.F.Libby，Physical Review 93，p.1337（1954）；http://link.aps.org/ab stract/PR/v93/p1337.

The copyrights and trademarks in the Challengers of the Unknown，June Robbins，ULTIVAC，Felix Hesse，Floyd Barker，the Atom，Wonder Woman，Plastic Man，Green Lantern，Ken Warren，Dr.Manhattan，Jon Osterman，and related logos and indica are owned by DC Comics Inc.(https://www.daowen.com)

The copyrights and trademarks in Groot，Leslie Evans，Evans's wife，town sheriff，bystander，and related logos and indica are owned by Marvel Entertainment Group Inc.

The copyrights and trademarks in Dr.Solar，Dr.Clarkson，and related logos and indica are owned by Random House Inc.

The copyrights and trademarks in Dick Tracy and Sam Catchem，and related logos and indica，arc owned by Tribune Media Syndicate Inc.

The copyrights and trademarks in Dagwood Bumstead，dog Daisy and puppies，Alexander（Junior）Bumstead，Cookie Bumstead，Mandrake the Magician，and related logos and indica are owned by King Features Syndicate Inc.

The copyrights and trademarks in Buck Rogers and Wilma Deering，and related logos and indica，are owned by Dille Family Trust Inc.

The cover illustrations of Amazing Stories，August 1928，December 1936；Science Wonder Stories，February 1930；Air Wonder Stories，April 1930；and related logos and indica are owned by their respective copyright holders.