I see at least three errors, maybe four. What do you see?
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Missing apostrophe. It should be It’s (“it is”), not its (possessive: “that thing’s”).
Missing period or colon. The clause …why Britain won WW2 should end with either a period (i.e., end of statement) or a colon (i.e., reason/explanation to follow).
Missing period. Scissors beats paper. Period.
(maybe… probably) Scissors is grammatically plural, so Scissors beat paper.
People can argue over that last one, but we normally say
The scissors are sharp, not The scissors is sharp.
The Merriam Webster Dictionary site has a good article on how scissors is a plurale tantum (plural: pluralia tantum), or a plural noun representing a singular object and having no grammatically singular form. Another plurale tantum: pants.
Since I lost weight, my pants are now too big for me.
Google “list of pluralia tantum” to see how many you already know.
Do you know anyone who says “a scissors” instead of “a pair of scissors”?