Presidential meetings usually are about classified information, which means that they can be top secret, secret and confidential. Usually, in these presidential meetings matters of national security and defense against terrorism are discussed and if information of these meetings is released to the public national security might be at risk.
Despite this, The Presidential Records Act - created in 1981 - determines the preservation of all presidential records. The Act determines that public access to Presidential records can begin five years after the end of the Administration.
Yes and no. Mutations in experiments can be helpful to learn new things medically. At the same time negatives can come from it like stronger viruses.
Right before the 20's started World War I happened, so many of the young men of the world were apart of that war and saw horrific things. So after the war they wanted to forget so they had as much fun and parties as they could.