Who invented microscopes? (this one is for fun. i will be giving away 50 points to the first person! )

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende

Modern weaponry has increased the number of deaths in wars and violent conflicts.

Which fact represents evidence for the big bang theory?