1) The Federal Reserve System, often referred to as the Fed, is the central banking system of the United States.

2) The concept of reinsurance, which is insurance for insurance companies, originated in the 17th century.

3) The ongoing conflict in Syria, which began in 2011, has resulted in a humanitarian crisis, displacement of millions of people, and international efforts to bring about a resolution and provide aid to those affected.

4) The strongest natural material known to man is spider silk. It is stronger than steel and more flexible than nylon.