Can humans talk on the phone and do anything else correctly?

Is there any remaining doubt that humans cannot do two things at once — specifically, drive and talk on the phone?

Now, a Canada Transportation Safety Board report says people can’t fly and talk so well either, at least in the case of a crash in British Columbia last November that killed a man.

In the report, released this summer, the investigators found the pilot spent much of the flight on his cellphone and was unable to maintain a consistent altitude during the calls.