It sounds like a boring topic, but concrete is one of the most revolutionary inventions in history.
For example, concrete now weighs more than everything else humans have ever made combined.
So here's the story of how it has changed the world, for better and for worse...
What is concrete?
Put simply, it's cement (the magic ingredient) mixed with aggregates, like gravel and sand, plus water — the cement acts as a binder which reacts and sticks the aggregate together.
Your pour it into a mould and what was a liquid soon becomes hard as rock.
And it has been around for thousands of years.
The Egyptians, Mycenaeans, and Nabataeans all used some form of concrete.
But it was the Romans who were the first real masters of concrete — the things they built with it, like the Aqua Alexandrina, are astonishing even now.
You can learn a lot about history just by looking at the words we use.
Like algorithm, which is descended from the name of a 9th century Persian polymath called al-Khwarizmi.
So, from romantic to cynical, here are the strange stories behind 12 incredibly normal words...
1. Left Wing and Right Wing
In the French Assembly, after the revolution of 1789, supporters of the monarchy (i.e. conservatives) sat to the right of President and supporters of the new regime (i.e. progressives) sat to his left.
A literal meaning that became ideological.
2. Romance/Romantic
During the Middle Ages Latin was the language of the church, but not of regular people.
In France they spoke Old French, which originated in Latin but had changed a lot.
So it was called a "Romance" language because it wad descended from the Romans.
When it was finished 334 years ago they called it the Eighth Wonder of the World.
See, people usually associate Baroque Architecture with Europe, but some of the best Baroque is in Latin America...
Baroque is one of the most distinctive styles of architecture — you know it when you see it.
Extravagant, opulent, maximalist, and full of movement.
It is defined by curved rather than straight lines, lavish decorations, and large, open spaces.
If one motif sums up the Baroque it is probably the "Solomonic Column", a type of twisted column that became popular during the rise of Baroque Architecture.
They were used by Gianlorenzo Bernini for his colossal bronze baldachin at St Peter's Basilica, Rome: