Galileo Galilei

First thing first, don't expect to find the biography of Galileo here because I'm not going to write fully about it. I'm sure you can find a better and more valid biography somewhere else.

What I'm going to write here is just how brilliant he is. As far as i know, he invented a hell lot of thing in the 16th century. Telescope is one thing. It was him who were also stood firmly against the geocentric theory and prove it (poor Capernicus. He was murdered by the order of the Roman Church at that time because he was the first person to say it). Galileo was the first person to utilize the telescope to observe the galaxy and discovered a number of Jupiter's satellite, to find out that the moon is not perfectly flat, and many more. Galileo also produced a number of theory which underlies the modern science. His theory was the breakthrough to almost every astronomical discovery in this modern era. Or maybe we can say that Galileo "invented" almost every scientific discovery in the modern era with his theories and discoveries. The very Albert Einstein even called Galileo as "The father of modern science".

Enough for the introduction. We all know that he was so great, he discovered this and that, and so on. But it's not because of those discoveries I mentioned above that I make this post, but it's because one simple tool he made: The Galilean Thermometer. It's a very simple thermometer, which work based on the buoyancy principle and density. Very very simple. The thermometer is formed by a single tube and some bulbs marked by temperature scale. The tube and the bulb is filled with a particular fluid; and the fluid inside the bulb is given some different color which i believe is a piece of art-work. Galileo briliantly make use the characteristic of fluid which it's density changes with the temperature. Here's how it works: arrange the bulb from the least dense to the most dense from top to bottom inside the tube, then fill the tube with the fluid. When the tube is heated, the fluid's temperature inside raise and so is the bulb's. And as the fluid inside the bulb become less dense with the raise of the temperature, the bulb will float. Just imagine a lava lamp and you will get the picture of it. We can measure the temperature by looking at the scale under each bulb. It was simply brilliant. A very perfect combination of bright mind with a little touch of art. Indeed it's a thermometer, but it's a cute yet beautiful decoration. I was thinking if maybe we can find a glow-in-the-dark fluid to fill the thermometer with some decorative color. Once again, amazingly brilliant. Galileo Sir, you got my full admiration.