Misc: Name the treaty of 1929 which recognised Papal authority within the Vatican City?

Questions

who was the american inventor of the cotton gin.?

who mumbled, 'i could of been a contenda' in 'on the waterfront'?

what is the better known identity of minus 273.15 degrees celsius?

in what year was the first gnu c++ compiler released to the public?

a pugilist is a _________?