July 23: Genetically modified vaccine approved, the first mouse replication in the world

Notable scientific events on July 23 in history.

July 23, 1986: Genetically modified vaccine approved for use

In 1986, the FDA Food and Drug Administration approved the production of new hepatitis B vaccines . This is the world's first DNA recombinant vaccine, studied by Merck & Co. with the name RecombivaxHB .

This is an effective alternative to the old hepatitis B vaccine, which is made from the blood of chronic hepatitis B patients. The new method helps increase immunity to hepatitis B virus, thanks to changing the genome on humans.

July 23, 1998: The world's first mouse replication case

In 1998, a group of scientists in Hawaii, headed by Professor Ryuzo Yanagimachi published the results of the research and successfully tested a mammal cloning . They said it was successful using cells from an adult mouse to create 3 generations of cloned mice.

More than 50 mice that were cloned in the laboratory all had identical fish characteristics. With the cloning of unsuccessful clones of animals, scientists will have more opportunities to study genetics, find genes that regulate aging as well as some incurable diseases.

July 23, 2010: The biggest hailstorm in history

In 2010, the biggest hail in history fell on Vivian, South Dakota. Each stone has an average weight of 0.88kg and a diameter of 20cm. This hail caused great damage to property, but fortunately there were no casualties.

Scientists brought the biggest stone in this hail to the lab to study. They will also create a second version for display at the museum.