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supreme leader ayatollah khamenei says no—one should here think they can turn over the islamic republic. crowds have once again filled the streets where dozens of people were reportedly killed by security forces. now on bbc news, click. this week, we are celebrating 100 years of the bbc in 23 minutes. 100 years of the bbc in 23 minutes-_ 100 years of the bbc in 23 minutes. ~ ., ., ~ ., minutes. we will look at the secret behind _ minutes. we will look at the secret behind the _ minutes. we will look at the i secret behind the broadcasting technologies that changed the world. b, tec...

The bbc had actually opened up two studios at alexandra palace. this, studio bee was a mechanical system which was made byjohn logie baird and produced image like this. meanwhile in studio a they were trailing an electrical assisting by em! and what they would do as they would alternate studios and systems on different days so they could compare the result and it turned out that emi's images at 25 frames per second were double the quality of the baird system. it had other advantages too stopping the baird camera was enormous. that emi one was somewhat more portable. and was enormous. that emi ...