new danger of fraud!

This was sent to me today. You will be asked to deposit 0.2 BTC (Bitcoin) worth approximately $ 1300 to "verify your account". However, the site is a forgery with…

Prove that MAX-2-SAT is NP-hard

According to Wikipedia, the 2SAT problem is polynomial, but the maximization variant MAX2SAT is NP-hard. However, they give no indication of this claim. Is that obvious? If not, where can…