While products are generally thought of as tangible personal property, products liability has stretched that definition to include intangibles (gas), naturals (pets), real estate (house), and writings (navigational charts).
According to the US Census Bureau's population clock, the estimated 2018 United States population (February 2018) is 327.16 million. This is a bit higher than the 326.77 million estimated by the United Nations.
According to UN estimates, the world population reached 1 billion in 1804; rose to 2 billion 123 years later, in 1927; to 3 billion 33 years after that, in 1960; to 4 billion in 1974; to 5 billion in 1987; to 6 billion in 1999; and to 7 billion in 2011.