Input question: What is an apparatus consisting of a frame containing a number of parallel wires on which there are rows of beads which can be moved left and right?

Output answer: abacus

Input question: The River Danube is on what continent?

Output answer: europe

Input question: What is a highly magnetized, rotating, neutron star emitting a beam of electromagnetic radiation that can only be observed when the beam of emission is pointing towards the Earth (known as the lighthouse effect)?

Output answer: pulsar

Input question: The Greek word praxis refers to what, contrasting with theory?

Output answer:
practice