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Photo credits

Photos are from Wikimedia Commons, cropped and converted to greyscale. Each links to its source page with full licence details.

• Nikola Tesla — Napoleon Sarony · Public domain
• Mata Hari — Unknown photographer · Public domain
• Franz Kafka — Unknown photographer · Public domain
• Josephine Baker — Studio Harcourt · Public domain
• Richard Sorge — Unknown author · Public domain
• Hedy Lamarr — Unknown author · Public domain
• Buster Keaton — Bain News Service · Public domain
• Harriet Tubman — Powelson, Benjamin F. 1823 - 1885 · Public domain
• Grigori Rasputin — Unknown author · Public domain
• Moe Berg — Kashin Publications · Public domain
• Peter Lorre — Unknown author · Public domain
• Roald Dahl — Hans van Dijk for Anefo · CC BY-SA 3.0
• Marie Curie — Henri Manuel · Public domain
• Klaus Fuchs — The National Archives UK · Public domain
• Erik Satie — Henri Manuel · Public domain
• Noor Inayat Khan — Unknown author · Public domain
• Agatha Christie — Joop van Bilsen for Anefo · CC0
• Aldrich Ames — staff, Federal Bureau of Investigation · Public domain