Buildings and bridges are examples of structures ... And we can do this by adding a support called a buttress. They support the structure by making the bottom wider. This helps to prevent it ...

Building buttresses to support your heavy dome is a good solution -- but it won't work here. When the magnificent Turkish cathedral Hagia Sophia collapsed only 20 years after it was built ...

You can do this by building fish ladders. Fish ladders look like a series of small waterfalls alongside a dam. Salmon swim upstream, and they "jump" from one waterfall to the next, until they ...