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问一下这两句英语句子He also noticed that some houses had had no deaths

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问一下这两句英语句子
He also noticed that some houses had had no deaths.
Scientists have had the theoies that rising temperatures could harm crops.
我想请问一下
第一句为什么连用两个had
第二句什么头一个have后面又加had
第一个是过去完成时,前一个had是助动词,后一个had是动词,因为这句话是用过去式写的,所以就用过去完成时
第二个客观存在的,所以用现在完成时