My only hardware design experience was back when I was in college using MAX+PLUS. It was confusing to me at best. Gone are those days. Today I came across circuits.io. Basically, you can make your circuit design in your browser! I can imagine one day circuit design can even become open source.
Recently I came across this currency exchange peer-to-peer service called CurrencyFair. I haven’t had a chance to try it out yet, but it looks quite promising. Basically, you get the best exchange rate by skipping the banks. They claim their commission rate is 0.15% only, much lower than anything you could possibly find.
I am not sure what I did that led to this error. I was simply doing some typing in TextEdit and some web browsing. Then while trying to open a pdf file, this happened. Then I tried opening some other picture files and it was the same error. Basically, Preview.app stopped working and kept giving me this -600 crash error.
To fix this, you need to reboot. Yea, I know, I ran out of ideas, so rebooted, and the error went away. Hope this helps!