I thought sex was determined at time of fertilization by the chromosomes. If a sperm carrying a Y chromosome meets an egg carrying an X chromosome, won't the resulting fetus always be male? Is that not the case?

Dang. You're right.

What has helped me convince my friends is to mention the features and not mention the privacy. Most people care about features and convenience but don't care at all about privacy. When I'm trying to convince my friends to switch to Signal, I usually say something along the lines of "it's like iMessage for Android" and give a small demonstration of the features.

What is the context of this photo?

Not anymore after they got acquired

It took me too long to realize that the "two people" were the ones in the background and not Zuck and the llama.

Yes, I have that too. You're not alone.

Non-blue grey. A lot of greys will have a blue tint. I like grey that doesn't have that blue tint. I like it because it's a neutral color that's easy to match bright colors to, but it doesn't feel dated like beige. If I had to pick a specific shade, I'd pick 50% grey, but I like a lot of greys.

Maybe that one Capuchin monkey

Good point. It seems I wrecked myself before I checked myself.

Why? I've never heard this before.

It's a balance between convenience against privacy and security. The more private and secure you become, the more inconvenient. If something is too inconvenient, people will just work around it: writing passwords on a sticky note because the requirements were too high. It's impossible to strike the perfect balance. Threat modeling is important. Threat modeling is where you determine what is OK and what isn't. I have an Instagram account because my girlfriend likes to send me funny videos. I only use it to watch what she sends me, and I have it isolated from the rest of my apps. I could delete it, but my threat model allows it.

Side note: anything cryptography and computing is basically magic.