पोस्ट ऑफिस लेटर बॉक्स हमेशा लाल रंग का ही क्यों होता है ? Science of Red Attractiveness - TEF Ep 53

Do you know why post office letter box is always red? Did you know that NASA used 4KB ram machine for the moon mission? Let's explore some science facts in the episode 53 of TEF (Top Enigmatic Facts).

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