This is in a lot of shows and not just sitcoms, but I hate contrived argumentative dialogue that's set up so that the protagonist always gets the last word with "witty" responses/comebacks. It's like watching a "I'm the attractive Chad and you are the ugly NPC" meme in real time.
The fact that calcium is a metal is the reason why bones can be detected in X-rays.
(I'm pulling this out of my ass and I'm too lazy to look it up to see if it's actually true.)
Are we talking first computer in your household, or first computer you ever bought yourself?
Our first family PC was a hand me down from my uncle that we got when I was 12 or 13. 486DX2 66MHz processor, a couple MBs of RAM, 700-ish megabyte hard drive, Windows 3.1 and DOS. AOL install disks didn't work on it because they needed at least Windows 95, and I was still clueless on how to set up a modem connection in 3.1. So it was entirely for games installed via disc only. We ended up getting a Windows 98 machine a year or two down the line.
First PC I bought for myself was a custom built machine from a computer shop that has long since gone out of business. I think I paid around $200 for it, so it was a fairly basic PC for 2004. Athlon 1.5 GHz CPU (with a loud as fuck cooler fan), 512 MB RAM, a video card that I forgot the make and model of, Windows XP. Lasted me about 3 years until I built one myself.
Unfortunately in a country where the infrastructure is so hostile to public transit or even pedestrian/biking amenities that it's nearly impossible to live, work or function without a car unless you're lucky enough to live in a dense urban community, I can see how people might believe this.