#383 How do LED lights produce different colors?
How do LED lights produce different colors? By using different materials that produce light at different wavelengths. LED stands for Light Emitting Diode and they are very different to regular…
How do LED lights produce different colors? By using different materials that produce light at different wavelengths. LED stands for Light Emitting Diode and they are very different to regular…
When did we start using tarmac on roads? Tarmac (asphalt) only really became popular once the motorcar was invented. Once you know that, it seems obvious, but it never really…
Why is glass transparent? Glass is transparent because light photons don’t have enough energy to excite the molecules in the glass. There are two things we need to look at…
How quickly are the continents moving apart? Our continents are moving apart at a rate of 2.5 cm every year. The surface of Earth is divided up into 15 tectonic…
Can the Mona Lisa ever be sold? The Mona Lisa, by Leonardo da Vinci, can never be sold because it is owned by the people of France. There was a…
What is & called and why? The symbol “&” is called the ampersand, which actually means “and, by itself, and”. It is also a shorthand version of the Latin word…
What is a Scramjet? It is an air breathing jet engine that works at supersonic speeds. Right. There are three questions we need to unpack here. How does a jet…
How can paints be different colors? To make different colored paints, you need to add different materials for color pigments because different particles reflect different wavelengths of light. Our eyes…
When did people start wearing wristwatches? People started wearing wristwatches during World War 1. Clocks had been around for some time before the first watches appeared in the 15th century,…
Why does a chicken’s head stay perfectly still when you move its body around? Because chickens cannot move their eyeballs in their eye socket and because they don’t have a…