What made the battle of antietam the single bloodiest day in american history?

Which german count invented the zeppelin

President of the united states has scheduled a cabinet meeting today to discuss energy policy with specific focus on pollution and global warming. given what you know of the executive branch, which group of attendees would the president most likely expect to provide up-to-date information and expert insight during this meeting?

What does portia compare a rumor to? how does she describe how the rumor is circulating? what is shakespeare's purpose in using this imagery?