Unidentified Flying Objects have always existed. In the US, around 99% of submitted cases were identified eventually or revealed to be bogus. The remaining 1% exist, but the track record of identified stuff doesn’t give the alien explanation a high likelihood.

You divide by the old price, not the new one:

12.5 / 8 = 156%

Generally a good rule, however Signal did develop their own encryption. It was so good it became the industry standard.

That wouldn’t guarantee correct answers.

It’s arguably more dangerous if ChatGPT gives mostly sane specific medical advice because it makes people put more trust in it than they should.