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Atoms
Otto Hahn discovered that the world was made of atoms P.14 -
Water Droplet
Bohr suggested that the nucleus of an atom might act like a water droplet P.15 -
Fission
Called this splitting of atoms fission P.16 -
U-235 Atoms
When scientists figured out that only some atoms fissioned and those atoms were U-235 P.123 -
First Atomic Bomb Set Off
Trinity Site near Alamogordo, where the world's first atomic bomb exploded. P.183