Read captions for more details . The parabolic mirrors allow the sun’s rays to be concentrated in a focal ... solution to light
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![【4K】BUDAPEST Keleti Railway Station - Full Tour - With Captions [CC]](https://sun9-19.userapi.com/aw4lnXP9zJiust9-C7Be-KVw5GriiISIII-PFQ/jGFyvhEQ5kc.jpg)
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![Russia around the period of the Russian Revolution in color! (1917-1919) [A.I. enhanced & colorized]](https://sun9-45.userapi.com/v1ZwOA_LWNuclHGsiQ7EzR3mrIKYmFojFRv2ZA/XhHTHUBzd1I.jpg)
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