The standard model describes four fundamental forces; gravitational, electromagnetic, strong and weak. How is gravity different? [Read more…] about How does gravity compare to the other fundamental forces?

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## Fundamental Forces

There are four fundamental forces of nature: gravitational, electromagnetic, strong and weak. Each force can be explained using fields and 3 also have bosons associated with them, known as force carriers. [Read more…] about Fundamental Forces

## The Birthday Paradox

In a group of 23 people, the probability that 2 of them share a birthday is 50%. This fact may seem strange at first, but can be proven by fairly simple mathematics. [Read more…] about The Birthday Paradox

## Dark Matter

Galaxies within the universe have been observed to be rotating much faster than we had initially predicted. The gravity produced by the matter which we can observe is not enough for these speeds to be reached, therefore scientists believe that there is extra mass in the universe that we just cannot see, dark matter. [Read more…] about Dark Matter

## Dark Energy

The rate of expansion of the universe is increasing however, scientists have no explanation of why. The force of gravity should be slowing it down, but we have concluded that there must be some other energy in the universe causing this expansion to accelerate. [Read more…] about Dark Energy

## Finding the Circumference of Earth

Eratosthenes made an estimate of the circumference of the earth over 2000 years ago. Using measurements of the angle of shadows in just 2 places, his calculations produce a surprisingly accurate result.