I learned this today. The tallest a human could potentially grow is about 9 feet, 274cm. Humans grow because of a growth hormone called somatropin. It stimulates growth by telling cells to reproduce. It is released by the pituitary gland. It reacts with a specific receptor on the surface of cells, and it stimulates cell […]
#58 How tall could a human grow? Read More »
I learned this today. Standardized time and time zones weren’t needed until rail travel became popular in the 1850s. Having international time zones seems common sense to us these days. How can you conduct business in New York from London if you don’t know what time it is there? And knowing how many hours ahead
#37 Why did we start using time zones? Read More »
I learned this today. The Kardashev scale describes five different levels of technological civilization, and we, as a species, haven’t even reached level 1. The Kardashev scale was, unsurprisingly enough, thought up by a Russian astrophysicist called Nikolai Kardashev in 1964. He originally decided on three types of civilization, but this has been extended to
#33 What are the 5 types of civilization? Read More »
I learned this today. Leather is strong because the collagen fibers in the animal skin are strengthened and bolstered by other chemicals. It can take up to ten weeks to make leather. Making leather is a complicated process. The first thing is to remove the hide. The skin of any animal can be used to
#14 How is leather made? Why is it so strong? Read More »
I learned this today. Labradors are used as guide dogs because of their temperament, but also because of their size. Guide dogs have been used for centuries. There is a painting of a blind man being led by a dog on the wall of a Roman house that was buried by the eruption of Vesuvius
#5 Why are labradors used as guide dogs? Read More »
