Marie Curie measured the amount of X rays emitted by these elements and defined the term _________
radioactivity
_______ _____ perfected the work of previous scientists and invented a practical electric light bulb
Thomas Edison
The claw that Archimedes designed includes a _____ and ______.
crane and hook
______ ______ discovered two new chemical elements, polonium and radium
Marie Curie
What are some of Archimedes inventions?
catapult, claw, and screw
_____ is one of the earliest inventors that we know
Archimedes
_____ _____ was a mathematician and a scientist who developed a theory to explain the force of gravity.
Issac Newton
Thomas Edison also invented the first _______ for listening to music.
phonograph
Newton´s theory of _____ helped explain the movement of the planets around the sun.
gravity