Unusual polarimetric properties for interstellar comet 2I/Borisov.

So far, only two interstellar objects have been observed within our Solar System. While the first one, 1I/'Oumuamua, had asteroidal characteristics, the second one, 2I/Borisov, showed clear evidence of cometary activity. We performed polarimetric observations of comet 2I/Borisov using the European Southern Observatory Very Large Telescope to derive the physical characteristics of its coma dust particles.

Evaluation of otoacoustic emissions in clinically normal alert puppies.

Objective: To evaluate distortion product otoacoustic emission (DPOAE) measurements in puppies with normal hearing.

Animals: 23 clinically normal 7.5-to 10.