#867 What is the upper limit of a speaker?
What is the upper limit of a speaker? The loudest speaker ever made produced 165 decibels. No speaker could ever go above 194 dB, because sound has an upper limit,…
What is the upper limit of a speaker? The loudest speaker ever made produced 165 decibels. No speaker could ever go above 194 dB, because sound has an upper limit,…
Nils Bohlin invented the three-point seat belt in 1959. There is no way of working out how many people his invention has saved, but it must be over a million,…
Why do some birds have red eyes? Birds with red eyes have a lot of tiny blood vessels in their eyes. Human eyes come in one of six colors. Our…
What causes the bends? It is caused by the rapid release of nitrogen gas from the bloodstream. You don’t have any risk of the bends if you don’t go very…
How does chilling a patient after cardiac arrest work? If the body temperature of a person whose heart has stopped beating is lowered, they can survive for longer without oxygen,…
What is a karat? It is a way to measure the purity of gold. (In the UK, karat is spelled as carat – more on that later). However, a carat…
What was the Great Stink? It happened in Central London during June and August 1858, when the smell of the River Thames was unbearable. The city of London grew up…
How does a monorail balance? The single rail of a monorail train is much wider than a rail on a regular railway and there is no worry about balancing. However,…
During his career, Maurice Hilleman developed over 40 vaccinations. It is thought that his vaccinations save over 8 million lives every year. However, he was not interested in making a…
Is palm oil bad? It depends. It is bad in terms of health and environmental costs, but it is good because it has more oil than other crops and provides…