tv: How did Doyle give Cordelia the visions?

Questions

what is mixed with kahlua to make a 'black russian'?

what colour was the maltese falcon?

at least how many times a year does one blink?

which pop star appeared in many of the 'gidget' films, and hit no 3 with the calliope sound of 'goodbye cruel world' in the early 60's?

what is the condensed water vapour in the sky left behind jets?