How many rivers stop flowing during part of the year

Many rivers stop flowing for part of the year

About half of Earth’s rivers and streams stop flowing during part of the year. Dry seasons, freezing weather, or a lack of melting mountain snow can interrupt their flow.

A 1917 encryption idea led to the one-time pad

In 1917, Gilbert Vernam proposed combining a message with a separate secret key. This idea helped lead to the one-time pad, an encryption method that cannot be broken mathematically when its key is truly random, kept secret, and used only once.

Some groundwater stays underground for more than 10,000 years

>10,000 Years

Water can remain underground for more than 10,000 years. By comparison, water stays in the atmosphere for only about nine days on average before falling again. Very old underground water is often called fossil water.

Like this? There’s a whole feed of it. Replace empty scrolling with things worth knowing.

Download Hence for free

How many rivers stop flowing during part of the year

Many rivers stop flowing for part of the year

Keep exploring