Milk news [books, work]
Dec. 4th, 2025 11:53 amI am currently reading Ed Yong's I Contain Multitudes because while teaching General Biology I got to thinking I could stand to learn and think some more specifically about prokaryotes. Sure, I'm a biologist, but I definitely don't know everything there is to know about biology! Far from it.
Somewhat hilariously, some of the earliest parts of the book turned out to be exceptionally ho-hum to me, but I think this is just because I spend a lot of my waking hours thinking and reading about a wide range of topics in biology, and those already often include a lot of the big Microbial Gee-Whiz concepts/discoveries/facts. So I appreciated how Yong can write eloquently and enthusiastically about the topics, but they land a little differently for someone who is going, "Okay, and now what?" I mean, aren't Wolbachia kind of old news?*
But last night I got to the chapter about milk. I'm not going to spoil it for you, but I learned things, and it was really fun to read because I'd just read about how seal milk contains even more complex oligosaccharides than human milk. (okay, small spoiler, Yong pokes at the question of, "Okay, but what are all those oligosaccharides in milk actually doing, because they aren't directly nourishing the baby, turns out!").
Somewhere in the midst of it all, I also only just learned that milk is basically modified sweat. That actually made a whole lot of things make a whole lot more sense to me, finally! Like specifically, how there are animals that can produce milk, except not with mammary glands? I believe there are even some insects that can produce milk. Also, isn't it both hilarious and gross to think about milk as modified sweat?
Fun things to think about over lunch.
We shall see what the next chapters of Yong's book bring. I'm glad I continued reading.
--
*If you're an insect biologist, you need to know about Wolbachia. But yes, Wolbachia are weird and complicated to think about, so I'm definitely not teaching about Wolbachia in an introductory course!
Somewhat hilariously, some of the earliest parts of the book turned out to be exceptionally ho-hum to me, but I think this is just because I spend a lot of my waking hours thinking and reading about a wide range of topics in biology, and those already often include a lot of the big Microbial Gee-Whiz concepts/discoveries/facts. So I appreciated how Yong can write eloquently and enthusiastically about the topics, but they land a little differently for someone who is going, "Okay, and now what?" I mean, aren't Wolbachia kind of old news?*
But last night I got to the chapter about milk. I'm not going to spoil it for you, but I learned things, and it was really fun to read because I'd just read about how seal milk contains even more complex oligosaccharides than human milk. (okay, small spoiler, Yong pokes at the question of, "Okay, but what are all those oligosaccharides in milk actually doing, because they aren't directly nourishing the baby, turns out!").
Somewhere in the midst of it all, I also only just learned that milk is basically modified sweat. That actually made a whole lot of things make a whole lot more sense to me, finally! Like specifically, how there are animals that can produce milk, except not with mammary glands? I believe there are even some insects that can produce milk. Also, isn't it both hilarious and gross to think about milk as modified sweat?
Fun things to think about over lunch.
We shall see what the next chapters of Yong's book bring. I'm glad I continued reading.
--
*If you're an insect biologist, you need to know about Wolbachia. But yes, Wolbachia are weird and complicated to think about, so I'm definitely not teaching about Wolbachia in an introductory course!


















