Leonardo da Vinci (1452-1519) was a genius born before his time. He had a way of seeing everything connected rather than as different fields of science that enabled him to conceive of miraculous and wonderful inventions. Most of his ideas were written down and collected by him in notebooks. With over thirteen thousand pages in his lifetime, there are still notes and diagrams that we have yet to study. Here are but a few of the wondrous imaginings come true, all of which can be found in detail scattered throughout his notes. In this list we take a look at some of his most recognized inventions and developments.
Category Archives: Science & Knowledge
Skin varies in type, color and texture from one person to another; but despite this divergence, everyone’s skin serves one main purpose, and that is: to protect the inside of the body. People are quite conscious of skin on some locations of the body, especially the more visible ones, like facial skin and the skin of your arms and legs. Generally though, we think of skin as something that’s always been there since we were born and as long we take reasonable care of it, it will continue to function as it should. Thus, in a sense, skin is probably one of the most taken-for-granted parts of the human body and most people know very little about skin. Here are some fascinating basic facts about your skin that not so many people know about.
Toxicity is usually measured in mouse units (MU), representing a dose of toxin that kills 50% of mice (LD50) when exposed to the toxic substance. In the following list ten of the most acute substances are ordered from least to most severe, a lethal dose for a 90kg individual is also shown. Although there are a lot more toxins and toxicants, these ten are well known and vary a lot in their respective lethal dose.