Brainstorm: a person can't swim, and he won't drown if he falls into the water. Why?

The Dead Sea contains a high concentration of salt, which is 8.6 times that of normal seawater, so that there is no life in the water, and even there is almost no life on the land along the Dead Sea except aquatic plants. This is one of the reasons why people named it the Dead Sea. Because the Dead Sea is surrounded by land and is not connected with other rivers and oceans, there is no tidal phenomenon in the Dead Sea.

The Dead Sea, a saltwater lake on the border between Israel and Jordan, is disappearing. According to the data of the World Environmental Protection Organization, the water level of the Dead Sea is decreasing at a rate of 3.3 feet (about 1 m) every year. With the decrease of water quantity, the salt concentration in the Dead Sea has greatly increased.