Hypothesis
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
A hypothesis is a tentative, testable explanation for an observation, proposed before the supporting evidence is in hand.
Show
"Plants near a sunny window grow faster because they get more light" is a hypothesis — testable, since an experiment could support or undercut it.
Watch for
A hypothesis untestable by any conceivable experiment, such as "plants grow because they want to," is not scientific.