by Dilip D’Souza

One day you spot the young enchanter you’ve had a crush on for months, but haven’t yet found the gumption to speak to. Still, you’re affected in ways you’ve heard about forever. You know – maybe you feel your heart beat faster? Maybe you think it skips a beat or three? You know the feeling, no doubt. But is your heart actually beating faster, or skipping beats?
I’m no expert on such hypotheticals. But I will suggest here that if you had a choice, you might be better off with skipping, rather than faster beats. Because there’s a sense in which if your heart beats more quickly, your life shortens. Having said that, I also don’t want you to worry too much about the possibility. We’re not exactly talking about years, or months, or even days, shorter. We’re talking … well, I don’t know. But there is a point here, and I’ll return after a short digression.
Now you may have noticed that you, the human that you are, live somewhat longer than your pet budgerigar who is, I’m guessing, smaller than you. You live a whole lot longer than the pesky mosquito that buzzes in your ear at night – and that’s even if its existence doesn’t suddenly end between your palms. And what of your pet giant tortoise who is, I’m guessing, larger than you? He lives somewhat longer than you.
Noticing patterns like this – for it is a pattern – makes mathematicians (well, other scientists too) say “By Toutatis! We have a correlation!” (Words to that effect.) In this case, a correlation between body mass and life expectancy: the heavier an animal, the longer it lives. For example, you, about 1000 times heavier than your budgie, will live about 5.5 times longer than she does. Your tortoise, about five times heavier than you, will live two or three times longer than you.
In fact, a scientist in Switzerland called Max Kleiber found a double-edged correlation lurking here. Heavier animals don’t just live longer, their hearts beat slower too. Your pulse rate is at least twice as speedy as the tortoise’s, but 5.5 times slower than the budgie’s. (Why 5.5? That’s both interesting and contentious, but of that, another time).
This is Kleiber’s law. Read more »



We sometimes say that someone is living in the past, but it seems to me that the past lives in us. It lives in our houses; it lies all around us. As I write this, I’m sitting on the couch under two blankets crocheted by my grandmother, who was born around the turn of the 20th century. The laptop sits on a folded blanket that came from Mexico via a friend years ago. And that’s just the surface layer. My closets and file cabinets are also full of the past.




Dear Reader,

Sughra Raza. Bey Unvaan. January, 2026.
Oy. Where to start? Let me begin with a recent abuse involving percentages. Trump’s absurd claims about price declines of more than 100% have elicited a lot of well-deserved derision. How could someone with an undergraduate degree in business from Wharton make these mathematically impossible claims?
2025 was a good year for books. 

