In physics, what theoretical object with infinite density would make escaping its gravitational pull 'impossible'?
Which historical engineering project, completed in the early 20th century, involved cutting a canal through a narrow land bridge, a feat many thought 'impossible'?
What is the philosophical paradox that explores the 'impossible' scenario of what happens when an irresistible force meets an immovable object?
What is the mathematical concept that describes an infinitely repeating, non-terminating decimal that cannot be expressed as a simple fraction, often considered an 'impossible' perfect measurement?
Which famous mathematician proved the 'impossibility' of trisecting an arbitrary angle using only a compass and straightedge, a problem that puzzled ancient Greeks?
In computational complexity theory, what class of problems is considered 'intractable' or 'impossible' to solve in a reasonable amount of time as input size grows, even for powerful computers?
What is the famous problem in computer science, proven by Alan Turing, that demonstrates the 'impossibility' of creating a general algorithm to determine if any given program will halt or run forever?
What is the name for the theoretical 'impossible engine' that would allow faster-than-light travel by warping spacetime, a concept often explored in science fiction?
Which philosophical concept, often linked to David Hume, suggests it's 'impossible' to logically derive prescriptive 'ought' statements from descriptive 'is' statements?
What type of number, symbolized by 'i', is defined as a solution to x^2 = -1, once considered 'impossible' or imaginary?