The Princeton Companions to Mathematics and Applied Mathematics are beautiful to leaf through at the library. They're also hardcore heavy-weight (physically) and unlikely to be read twice, so don't buy them.
My personal take is that good linear algebra books at any level are great "tours of mathematics". Start with Strang and never stop. In a few years you'll be balled up with Kreyszig scribbling proof attempts in receipts, flaming unkempt hair and everyone around you will think you're weird but you'll be so, so happy.
About two years ago I tried membership in The WELL, the semi-mythical web community that used to be featured in the printed booklets that came with 28.8kbps dial-up modems.
The retro interface was nice but the populace was incredibly homogeneous and everything was saturated with San Francisco liberal politics. I concluded that the insurmountable joining fees led the website to be frozen with a small self-referential community.
I mean, I'm a lukewarmist, not a denier, but since the 90s people have been saying "science advocacy" when they mean "advocacy for my politics". Everyone's (correctly) for Darwinism and contra modern creationism but no one seems to be in favor of IQ advocacy.
And I mean advocacy for the low IQ cohorts that are being technologied out of a social role. But hey, you would have to admit IQ exists.
Tyson is intellectually underwhelming and doesn't seem to understand the limitations of his own knowledge. He's made his fame for speaking with the mannerisms of a preacher; and for remaking (in science a necessity) the Carl Sagan classic. He's already being forgotten by mainstream culture, which is not worse for it.