3 . In 2011, artist Grimanesa Amorós stepped off a boat made of totora reeds (芦苇) onto an island—also made of totora reeds — in the northwest portion of Lake Titicaca. It’s home to one of the world’s most innovative achievement of human engineering: the Uros Islands.

The man-made floating islands, which are home to the native Uros people, are created by putting layers upon layers of totora roots and reeds. This water-resistant plant grows in the lake and is the lifeblood of the Uros community. It is used to make boats, houses, roofs, mattresses (床垫) and more. The plant is also eaten and serves as medicine, and its flowers are used to make tea.

However, the Uros weren’t always dependent on the totora. More than 500 years ago, the growing Inca Empire began to invade the Uros’ mainland villages. To beat this threat, the Uros began to build the islands, which could be launched deep into Lake Titicaca, away from danger. Hundreds of years later, there are now about 120 of these constructed islands, with around 1,300 people living on them.

To build the islands, the Uros first gather large blocks of totora roots. Multiple blocks are pulled together, and the roots and reeds mix naturally to form a layer about 1 to 2m thick. The totora reed is laid on top of this floating base. The Uros use a long tool to reach deep down into the water and cut the plant above the base. Then, the reeds are dried in the sun for one to four weeks and bundled (捆绑) together using a rope. Once dried, totora reeds are placed in alternating directions on top of the root blocks and become the ground that the Uros walk and build their homes on.

Today, urban influences are evident on the islands: Solar panels power bedroom lights and small TVs; a radio station operates on the main island. It’s evident that these modern changes and tourism have changed the Uros’ life on the lake. One thing remains certain, though. As long as there is totora growing at Lake Titicaca, the islands’ rooted foundation will stay the same.

5 . In China, tea has become an important part of everyday life for thousands of years. As the tea-processing methods and tea culture have evolved over the years, tea sets have also changed to meet the practical and cultural needs.

During the Tang Dynasty(618~907AD), tea leaves were traded across the country and Asia. For the convenience of transportation and storage, tea leaves were pressed into bricks. To prepare tea, drinkers had to cut them into small pieces and boil them in heat-resistant teapots.

By the Song Dynasty(960-1279), drinkers started to turn the hard bricks into powders (粉末) that could be whipped (搅打) in a cup with boiled water. This whipped tea is most commonly associated with Japanese tea ceremonies today.

By the 1500s, tea bricks gave way to the form of rolled leaves. This innovation led to the invention and use of teapots as we know them today. These teapots originally came from the Yi Xing region of China and were soon copied throughout the world. Then Japanese teapot-makers moved the handle from the side to the top of the teapots.

Tea finally reached Europe in the 1600s, along with the necessary tea sets made in Japan and China. As English teapot-makers began to adapt the tea sets to their country men’s tastes, they eventually added a handle to the tea bowl because of the English habit of drinking hot black tea, which was consumed at higher temperatures. The size of teacups also grew to accommodate milk and sugar in their tea.

By the early 1900s, innovations in tea drinking became an American affair. The most revolutionary one was the tea bag, which was accidentally commercialized by Thomas Sullivan. He had been sending customers tea wrapped in silk bags. Rather than take the leaves out of the bags, as Sullivan intended, the customers put the bags into their teapots instead. Not only did the tea bags push the teapot back to the sidelines of tea service, they were also too large for teacups and led to the modern practice of drinking tea from mugs.