Yeah, no. Some text services and websites can/do remove content, so you might not be able to return to something at a later date without saving it locally. Once an email has been received on your end, that’s it: you have the email locally (or at least in your email provider); it can no longer be removed by the person that sent it.
If I screenshot an exchange on Bluesky where someone is saying wildly racist shit, they can later block me, delete the top-level comment and all the sub-comments, but I’ll still have that digital proof. If someone gets doxxed on Reddit and you screenshot it, you’ve got that forever, even when Reddit deletes the doxxing five minutes later. (They did that with someone that found out who Administrative Results was, and posted all the links backing up their claims. Also, Admin Results in a shitty person, and that’s why he and Garand Thumb/Mike Jones get along so well.)
Single digits, 100%.
Single digits range from -9F to 9F. Triple digits start at 100F, and can go way the fuck up from there. (And with climate change, they will!) Once you start approaching triple digits, you have to worry about humidity, because you can easily hit a combination that’s literally too hot to live.
Is -9F unpleasant? Sure. But you can layer clothing, and that will keep you comfortable. Death Valley has hit >130F, and when that happens people die, even if they drink gallons of water and stay in the shade.