I won't execute a maniac, even if it really is Jack.
Lord is negative. He doesn't have any peaceful roles. And you're Mafia.
Added 2 minutes later
Ugh, I forgot that Gur hinted that Jack is the maniac.
But executing him is the same as prolonging the game for another three days.
I propose a solution that will leave us against an obvious Mafia team of only two people the very next day.
Added 34 seconds later
http://ru.wikipedia.org/wiki/Фундаментальные_физические_постоянные
Here are the fundamental physical constants.
Look for evidence on Lex, since you like them so much, Zubr.
Or don't you want to look for evidence against yourself?