MathsHealth & Society
What day is it?
Where do days, months, and years come from? Keeping track of time is harder than you think.
Tips on tips
Going out for a meal’s a treat. You’ve enjoyed some good food and someone else is going to wash up - but then comes the bill and the embarrassment of figuring out how much to tip.
Counting calories
There are hundreds of diets on the market, but only one basic equation behind how we process food.