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Facts 181 - 190

181. A group of rats is called a "mischief" or "colony"!
182. A few drops of vanilla extract can flavor dozens of cakes!
183. The nose contains thousands of smell receptors, allowing us to detect a wide range of scents!
184. The human lung contain about 300 million alveoli!
185. A group of guinea pigs is called a 'group' or 'colony' – not a 'herd'!
186. The lung contains millions of tiny air sacs called alveoli for efficient gas exchange!
187. During the Middle Ages, tools were predominantly made of metal, thanks to advances in metallurgy!
188. In prehistoric times, artists created fascinating cave paintings!
189. The surface area of the human ear is typically less than 2 square inches!
190. Black holes have such strong gravity that even light cannot escape their grasp!
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