American British Sign Language raised eyebrows yes no questions

In sign languages, your eyebrows can change a sentence into a question

Sign languages use facial expressions as part of grammar, not merely to convey emotion. In American Sign Language, raised eyebrows commonly mark yes-or-no questions, while other facial patterns help distinguish different question types. The face works alongside the hands to encode linguistic information. A sentence can change meaning even when the hand signs stay the same.

Morse can stay readable in radio noise

Morse radio signals use about 100–150 Hz of bandwidth, far less than the roughly 2,400–2,800 Hz used for single-sideband speech. Receiver filters can isolate the narrow signal, and the ear's natural selectivity helps distinguish it from interference, even when signals are weak.

Iranians revived Persian culture after conversion

After most Iranians converted to Islam, they kept and revived their Persian language and culture. This process, called Persianization, also involved Arab and Turkic peoples.

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American British Sign Language raised eyebrows yes no questions

In sign languages, your eyebrows can change a sentence into a question

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