Safest way: DO NOT reply and BLOCK number.
If you are not sure if the guy is related to some stuff, it will be better to call him back, instead of texting.
Uses of Radio Waves : The prime purpose of radio is to convey information from one place to another through the intervening media (i.e., air, space, nonconducting materials) without wires. Besides being used for transmitting sound and television signals, radio is used for the transmission of data in coded form.
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Explanation:
English mathematician and inventor Charles Babbage is credited with having conceived the first automatic digital computer. During the mid-1830s Babbage developed plans for the Analytical Engine.
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