Good morning, class. Today we're going to discuss the history of the bicycle. Now, many people assume that the bicycle was invented in the 19th century, but in fact, the first two-wheeled vehicle appeared in 1817, invented by a German baron named Karl von Drais. However, it had no pedals; riders pushed themselves along with their feet. It wasn't until 1860s that pedals were added to the front wheel. Interestingly, the first chain-driven bicycle, which is similar to modern designs, was introduced in 1885 by a British engineer. So, the key point is that the bicycle evolved over several decades, not in a single moment.