When 2020 came, he felt bad seeing the volcano eruption from the news. All those calamities he had witness from the news. Afterwards, the Coronavirus pandemic came, which saddened him more.
Aside from two world wars, civil wars, insurgencies, and different calamities, it was his second time to witness another pandemic. Mark's dementia didn't progress further, and he started to write his final book.
The 14th book detailed all the wars, the first pandemic he witnessed, and the second one, and how it was also politicized. He rushed to finish the book because his physical health his failing. He wanted to finish the book soon. There are times when he sleeps late just to finish the book.