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Speedometer

What is the difference between speed and velocity?

The terms speed and velocity are often used interchangeably. This isn't correct, and I will explain why below. Speed is a scalar measurement of the rate of movement of an object...
Bering Strait

Is there a bridge, tunnel, or ferry connecting Alaska and Russia?

While there is evidence that building a bridge or tunnel might be possible to connect these two locations, one does not exist. Also, there is no ferry connecting these...
ibuprofen

What is the difference between prescription ibuprofen and over-the-counter ibuprofen?

There is no therapeutic difference between prescription ibuprofen and over-the-counter (OTC) ibuprofen other than strength. Ibuprofen is a nonsteroidal anti-inflammatory drug (NSAID) medication used for treating pain, inflammation, and fever. OTC...
nuclear weapon

How many countries have nuclear weapons?

There are about 14,000 nuclear weapons in the world, a number that has been declining since the Cold War ended. While the exact number of nukes each country has are...
Worlds oldest library

Where do libraries get their initial set of books from?

New libraries use a process called "Collection Development" to decide what books to purchase as well as what books to discard. Books are usually purchased through jobbers or book...