What do you think was responsible for creating a previously unknown substance born from the Hiroshima atomic bombing?

Physicists discovered a new, previously unknown substance after analyzing the radioactive materials released following the 1945 bombing.

• Option 1: This is an example of nuclear fallout
• Option 2: The bomb created something entirely new
• Option 3: A long-lost element was found in the rubble
• Option 4: It's still being studied by scientists now