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...
The invention of numbers – by Peter Bentley
Giving a detailed account of the history of mathematics, covering the philosophical and scientific basis of our number system, this book is an entertaining and informative read. The 15 chapters...
Transistors
Making computers possible, transistors were invented in 1947. They are used as switches and amplifiers in circuits and are key to controlling flow of current. (more…)
Solar Cells – Applying the Photovoltaic Effect
Solar cells convert light energy into electrical energy using what is known as the photovoltaic effect, using the fact photons are absorbed by electrons when incident on a metal surface....
The particle at the end of the universe – by Sean Carroll
Based on the discovery of the Higgs particle, it starts by covering the fundamentals of particle physics. The first chapters explain key terminology and the brief history behind the subject,...
Feynman Diagrams
Feynman diagrams are used to graphically show particle interactions in a simple way. There are some basic rules which can be followed in order to learn how they are drawn....