1) Would not recommend the present (is), as we don't know if Mary's still alive, and even if that's true, it's not relevant to his findings at the time. 2). are works here, because it shows that the fact is still true today.
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Is it fine to switch tenses from past tense to present tense in a single sentence?Yes, of course, especially with expressions like found out.
CalifJimIn BrE, it would be I have just found out that I'm allergic to peanut butter.Is it fine to switch tenses from past tense to present tense in a single sentence?Yes, of course, especially with expressions like found out.
I just found out that I'm allergic to peanut butter.
CJ
In BrE, it would be ...Yes, I have heard that, but, to be honest, I'm not convinced that even the British consistently use only the perfect tenses with just. Maybe some of our British friends will comment.