India, Aug. 20 -- Many everyday objects exist around us, but we rarely take the time to consider why they look or function the way they do. For example, take the ceiling fan. In most Indian homes, it has three blades and spins overhead for hours, but the reason behind its design is rarely examined. So, why do ceiling fans usually have three blades? Is there actual science behind it, or is it merely a design convention?

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On the subreddit Explain Like I'm Five, one Redditor posed the same question, prompting netizens to weigh in with different explanations. From efficiency to turbomachinery, there are various explanations...