Hepatitis B virus, abbreviated HBV, is a species of the genus Orthohepadnavirus, which is likewise a part of the Hepadnaviridae family of viruses. This virus causes the disease hepatitis B.he early evolution of the Hepatitis B, like that of all viruses, is difficult to establish. The divergence of orthohepadnavirus and avihepadnavirus occurred ~125,000 years ago (95% interval 78,297â313,500). Both the Avihepadnavirus and Orthohepadna viruses began to diversify about 25,000 years ago.
Daylight Saving Time (DST) was first used in Germany in 1916. Clock in Prague, the Czech Republic. Many countries in Europe change their clocks to observe daylight saving time on the last Sunday of March each year. Pictured above is a clock in Prague, the Czech Republic's capital city.
While many states in the U.S. observe DST, there are still some exceptions. To this day, Arizona and Hawaii have opted against adopting daylight savings. And they're not the only ones. While most of North America and Europe observe DST, most of Africa and Asia do not.