{"acceptableClientSideUrl":"https://www.imdb.com/_json/getacceptableads/video?url=https%3A%2F%2Fwww.imdb.com%2Fvideo%2Fvi1641790745%2F%3Fref_%3Dtt_vi_i_6&subPageType=singlepage&adLayout=desktop_video&userLanguage=en&targeting=c%3D1&targeting=id%3Dvi1641790745&const=vi1641790745","acceptableSlotSizeMap":{"inline50":{"767":"320x50","1023":"728x90","1279":"728x90","9999":"728x90"}},"acceptableSlots":{"sis_pixel":{"slotMarkup":"\n\n\n\n\n\n\n

\n \n

\n\n\n\n\n\n\n\n\n\n\n\n\n"},"inline50":{"slotMarkup":"\n\n

\n"}},"adRefreshWebDisabledByBigRedButton":false,"apsSlotInfoMap":{"inline50_refresh":{"apsSlotId":"div-gpt-ad-1734420774-2_refresh","apsSlotName":"/22890456344/consumer-video-inline50_refresh"},"inline50":{"apsSlotId":"div-gpt-ad-1734420774-2","apsSlotName":"/22890456344/consumer-video-inline50"}},"clientSideUrl":"https://www.imdb.com/_json/getads/video?url=https%3A%2F%2Fwww.imdb.com%2Fvideo%2Fvi1641790745%2F%3Fref_%3Dtt_vi_i_6&subPageType=singlepage&adLayout=desktop_video&userLanguage=en&targeting=c%3D1&targeting=id%3Dvi1641790745&const=vi1641790745","hasPremiumAd":false,"headerMarkup":"\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n","slotSizeMap":{"inline50_refresh":{"767":"320x50","1023":"728x90","1279":"728x90","9999":"728x90"},"inline50":{"767":"320x50","1023":"728x90","1279":"728x90","9999":"728x90"}},"slots":{"sis_pixel":{"slotMarkup":"\n\n\n\n\n\n\n

\n \n

\n\n\n\n\n\n\n\n\n\n\n\n\n"},"inline50":{"slotMarkup":"\n\n

\n"}},"slotsEnabled":true}

Einstein's Letter (July 16, 1939) (2006)