What did lincoln steffens, jacob riis, ida tarbell, and john spargo have in common?

Following archduke franz ferdinand's assassination, austro-hungarian leaders: a. aided the ottoman empire in its campaign to keep serbia under its control. b. executed nearly all prominent serbs living in austria-hungary c. threatened to invade serbia if serb leaders did not agree to a set of strict demands. d.. formed an alliance with great britain to protect austria-hungary from future attacks.

Space is not completely empty. there are small particles in space. what happens when these particles come together?

The globe, the book of mathematics, and the scientific instruments in this painting demonstrate the renaissance interest in