system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: what does “beyond a reasonable doubt” mean?
gpt
It means where any doubt left isn't reasonable in light of the evidence that has been presented.

Reasonable doubt:

A video shows someone who might be the defendant committing a crime.  However, the video is blurry and hard to make out.  It would be reasonable to question if this is enough evidence to convict.


Beyond a reasonable doubt:

A very high detailed video shows the defendant committing a crime.  The defendant's face is clearly shown and looks exactly like them.  The height, build, etc of the person in the video matches the defendant.  The defence though argued that maybe aliens cloned the defendant.  This claim gives doubt but without evidence of these aliens it isn't beyond a reasonable doubt.