I feel like everyone is scouring their roof for micrometeorites these days. Here's a few videos on the subject:

https://www.youtube.com/watch?v=0xD7SvtPAMM

https://www.youtube.com/watch?v=9q3uNcJh4pc

Several of the examples shown in that article have a conspicuous round shiny blob on them. What is that? How does it get there?

Per jrockway's cool videos he posted in another comment, it's likely a bead of nickel or iron, mentioned at this timestamp:

https://youtu.be/0xD7SvtPAMM?t=389

Does anyone have resources for finding larger meteorites? The rooftop small ones are cool but are there ways to track larger ones?

I'd be interested to know what sort of distribution do they follow. Probably some kind of power law? The larger ones of course seem exponentially more difficult to find (the power law might break down due to gravitational clumping of large objects).

Here [1] is a great video about Larsen and his work on collecting microscopic meteroites.

Larsen's book, "In Search of Stardust: Amazing Micrometeorites and Their Terrestrial Imposters" [2] is also great, a gorgeous coffee table book with lots of high-quality photos of meteorites of the kind that you see on the web site.

[1] https://www.youtube.com/watch?v=9q3uNcJh4pc

[2] https://www.amazon.com/Search-Stardust-Micrometeorites-Terre...