Misc: nervous as a long-tailed cat in a room full of ______?

Questions

He was the son of Adam & Eve who was slain by his brother?

He was the U S president during the civil war?

He wrote 'the aeneid' & is generally acccepted as Rome's greatest poet?

Heat & light resulting from the rapid combination of oxygen, or in some cases gaseous chlorine, with other materials?

Helen Gurley Brown was the publisher of what magazine?