According to the tradition, Galileo Galilei discovered the law of the pendulum oscillations by observing those of the incense lamp that in his time was suspended in the center of the aisle of the cathedral of Pisa, and that we see in the image here on the side. To measure the period of oscillations of this pendulum, Galileo used the most accurate clock available at his time: its own heartbeat.
Certainly, the heartbeat can be a good reference to assess periodic regularity such as pendulum oscillations, but today we know that the heart rate clock is far from accurate. In fact, it is even more inaccurate the more one is in good health.
Let’s see how.
This article is the natural continuation of “A plastic of world…“published some time ago. At that time we did a roundup of the most important “traditional” plastics commonly used in for containers and packaging.
In this article we will look at the frontier of technology that deals with plastics.
Eyes unique in the world had a big contribution to the success of a great actress who was Liz Taylor.
The purple color of her eyes is due to a delicate balance of many factors, genetic and physiological, we will try to shed light on, in the article that follows.
In this article I explore a topic of which everyone, more or less, have a summary knowledge that comes from the school: the inner ear and in particular the cochlea. Continue reading