I've always loved hearing about London's history, so I was interested to hear that scientists are helping to uncover some of our past.
During new rail works underground, an old burial pit from 1665 was found. Using DNA testing, scientists discovered traces of the bacteria that caused the Great Plague. We still don't know why the last outbreak of the disease was so long ago, but the DNA could provide an answer.
Luckily for us, the bacteria don't survive in the ground, so unearthing our history isn't going to cause another outbreak!