While Morgan was running his businesses he was also working on inventions. In 1914 he patented a device that he (21) the Morgan safety hood and smoke protector. A patent is an official document that gives an inventor control over (22) may use their invention. The safety hood was an early gas mask. A gas mask allows people to breathe in (23) where there is a lot of smoke or dangerous chemicals in the air. In 1916 an explosion trapped some workers in a gas-filled tunnel under Lake Erie. Morgan attracted (24) attention when he used the safety hood to rescue some of the workers. In 1923 Morgan patented another safety invention. This was a T-shaped traffic signal. It (25) moving arms that told traffic when to stop and go. It was not the first traffic signal, but it controlled traffic better than many existing signals.

Morgan died on August 27,1963, in Cleveland. After his death several schools were named for him.

When another old cave is discovered in the south of France, it is not usually news. Rather, it is an ordinary event. Such discoveries are so frequent these days that hardly anybody pays heed to them.

However, when the Lascaux cave complex was discovered in 1940, the world was amazed. Painted directly on its walls were hundreds of scenes showing how people lived thousands of years ago. The scenes show people hunting animals, such as bison or wild cats. Other images depict birds and, most noticeably, horses, which appear in more than 300 wall images, by far outnumbering all other animals.

Early artists drawing these animals accomplished a monumental and difficult task. They did not limit themselves to the easily accessible walls but carried their painting materials to spaces that required climbing steep walls or crawling into narrow passages in the Lascaux complex. Unfortunately, the paintings have been exposed to the destructive action of water and temperature changes, which easily wear the images away. Because the Lascaux caves have many entrances, air movement has also damaged the images inside. Although they are not out in the open air, where natural light would have destroyed them long ago, many of the images have deteriorated and are barely recognizable. To prevent further damage, the site was closed to tourists in 1963, 23 years after it was discovered.