handling medications, drugs, including poisons - there was very little abou poisons she didn't know. Her book, "The Pale Horse" was about a serial killer who poisoned with thallium. Thallium poisoning tends to look like flu or a cold or other viral illness, which makes it difficult to detect, but it does make hair fall out. At least at that time, this kind of got ignored because the flu-like symptoms were more obvious. But, at least twice that I heard of, someone who read the book has a relative or a patient who died of "flu" but whosw hair fll out, and they reported it to British law enforcement, got an exhumation, tested for thallium and it was positive, and eventually the murders were solved and the murderers convicted.
My mother met her second husband once (her first husband, Archie Christie, was an infidelitous jerk, and the divorce couldn't happen soon enough, but her second, Max Mallowan, was an archeologist and actually knew how to value her - not just, as she quipped, ""Every woman should marry an archeologist - the older you get, the more interested he is."
I majored in Latin and classical Greek at Stanford, and not long after I graduated, the Archeological Society there invited him to speak and he did. IIRC, an invitation came to my home - this was in the late sixties and so much communication we have now didn't exist, and I wasn't there any more, I was in the Marine Corps somewhere in Virginia or New England or maybe San Diego, and couldn't attend, so she did. And that's probably a whole lot more than you ever wanted to know. 😊