Bats host many high-profile viruses that can infect humans, including severe acute respiratory syndrome and Ebola. A recent study explored the ecological variables that may contribute to bats’ propensity to harbor such zoonotic diseases by comparing them with another order of common reservoir hosts: rodents.

I can’t believe it’s 3 a.m. and you’re still up.

Yet I hoped by grouting at the earth below it to be able to dislodge the stone at the side; but while I was considering how best to begin, the candle flickered, the wick gave a sudden lurch to one side, and I was left in darkness.

A terse account, with no further explanation or detail, an indication perhaps of a grudging heart behind the offering.