A German institute confirmed scholars' doubts about their authenticity.
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"Honestly, it upset me just as much as it made me angry,” Lauren Gordon said.
The rookie, who has impressed the Browns so far, said he wants to give back to the city's Jewish community as much as he can.
The peace deal has been very unpopular in Jordan, which is home to a large Palestinian population.
The Kosher Expo event in Warsaw is part of an effort to increase and streamline the production and shipment of certified kosher products from the Central European country.