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But it was his other early work, studying the spectroscopic fingerprint of hydrogen, that would prove crucial a decade later, when he discovered an object that made a supernova look like a child’s cap gun.

At last Brad fired his cap gun.

The gang member fired a shot as he and Drake ran off, but the victims gave chase thinking the revolver was a cap gun, according to court documents.

There were four pops in rapid succession, like a cap gun.

There I am, with a cap gun and cowboy hat on Christmas morning some geologic age ago.