Related Clues:

• Sailor died clutching minute weapon
• Explosive crowd in airline showing up
• "Dr. Strangelove" subject
• Enola Gay's payload, in brief
• A grave mob shattering explosive device
• Weapon that might cause a grave mob riot?
• A grave old doctor spells out a threat to humankind
• A mob, misguided, going round grave for explosive device
• Mob disperses after sailor produces weapon
• Nuclear explosive device
• It's grave after a mob trashed device
• Having reached zero megabytes twice, it's very destructive
• Blood groups -- doctor's very powerful weapon
• "Fat Man and Little Boy" topic
• Manhattan Project project, informally