Slides that write themselves.

The text it was made from

1. Compound interest is interest on interest. Instead of taking out what you earn each year, you leave it in, so next year's interest is worked out on a bigger total.
2. Put ten thousand pounds in at seven percent and after one year you have ten thousand seven hundred.
3. Leave it alone and the curve begins to bend. After ten years you have roughly nineteen thousand seven hundred: nearly double.
4. After twenty years, about thirty-eight thousand seven hundred. After thirty, more than seventy-six thousand, from an initial ten thousand.
5. Simple interest, paid out and spent each year, would have earned twenty-one thousand over the same thirty years.
6. The difference is time. The steepest part of the curve comes last, so every year you wait to start is the most expensive year to lose.

The text it was made from

1. Coffee is one of the most traded commodities on earth, and the journey from a hillside to your cup crosses three continents.
2. It grows in the bean belt, the tropics either side of the equator. Brazil, Vietnam, Colombia and Ethiopia produce most of the world's supply.
3. Farmers pick the red cherries by hand, then dry or wash them to reveal the pale green bean inside.
4. Green beans are sacked and shipped, mostly to Europe and North America, where they are roasted close to the people who drink them.
5. Roasting turns a dense green seed into the brown, aromatic bean we recognise, in around twelve minutes.
6. Of the price of a cup, the farmer typically keeps around a tenth. Exporters, roasters, retailers and the café take the rest.

The text it was made from

1. An outbreak is a chain reaction. Each infected person passes the virus to others, and the average number they infect is called R.
2. In a town where nobody is immune, measles has an R of around fifteen: one case becomes fifteen, and fifteen become more than two hundred.
3. Vaccination breaks links in the chain. An immune person cannot catch the virus, so they cannot pass it on.
4. As more of the town becomes immune, each infected person meets fewer people they can infect, and R falls.
5. Once R drops below one, every case produces less than one new case, and the outbreak fizzles out on its own.
6. That is herd immunity, and it protects the people who cannot be vaccinated: newborns, and anyone with a weakened immune system.
7. The threshold depends on how contagious the disease is: about ninety-five percent for measles, eighty for polio, and closer to half for seasonal flu.