Math
Africa: The cartographic (and demographic) truth
5 minute read Tuesday, Aug. 26, 2025Two Africa-based advocacy groups, Africa No Filter and Speak Up Africa, launched a “Change the Map” campaign in April.
“When whole generations, in Africa and elsewhere, learn from a distorted map, they develop a biased view of Africa’s role in the world,” said Speak Up founder Fara Ndiaye — but hardly anybody outside Africa noticed.
That may be changing, because earlier this month the 55-member African Union endorsed the campaign, making it a diplomatic issue as well. The claim is that the traditional Mercator map of the world shows the African continent as hardly any bigger than Europe, whereas in reality it is at least four times as big.
That’s all very well, and it’s true that Mercator’s map projection dates from the 16th century, when European ocean-going ships were expanding and transforming everybody’s view of the world. But it’s also true that all flat maps distort the surface of a sphere (like the Earth) one way or another. Choose your poison, but you can’t have it all.
Gardening’s hidden benefits: How digging in the dirt could bolster mental wellbeing
3 minute read Preview Friday, Oct. 3, 2025As AI becomes part of everyday life, it brings a hidden climate cost
6 minute read Preview Friday, Sep. 19, 2025bbno$, the Beaches warn approaching TikTok Canada closure will hurt homegrown artists
6 minute read Preview Wednesday, Aug. 20, 2025Searing heat draws visitors to California’s Death Valley, where it’s tough to communicate the risks
7 minute read Preview Friday, Oct. 3, 2025AI-powered personal finance is here: for better and for worse
5 minute read Preview Saturday, Aug. 16, 20253 steps to save money when you’re tempted to spend
4 minute read Sunday, Sep. 21, 2025Why do so many of us struggle to save?
Saving for the future can be difficult because of a cognitive bias known as hyperbolic discounting: our tendency to place greater weight on immediate satisfaction, even if focusing on the long term will have a greater payoff. This bias is why, when you get a raise, you may consider getting a new car—incurring a higher monthly payment—instead of sacking away more money each month for retirement and perhaps getting to retire several years earlier.
Feeling stressed about finances can also get you off track with your savings. While some people respond to financial stress by saving more, others respond by spending more in order to regain feelings of control.
Unfortunately, these shortsighted decisions on spending versus saving can have large effects on our ability to achieve our future goals, because of the enormous power of compound interest. So, let’s talk about what you can do to keep saving when you feel the urge to give up.
Imagining that the machine is human
5 minute read Tuesday, Aug. 5, 2025When I taught computer science, often on the first day of class, once my excited nerdlings had sat themselves down in front of a computer to begin their quest to become the next Bill Gates and conquer the world, I would flick the classroom lights off and on several times.