Thunderbird won't let you access your Gmail account

Problem: You're trying to set up your Gmail acct in Thunderbird, but it won't accept your username/password and keeps asking you if you're sure it's correct.

Solution:
https://www.google.com/settings/security/lesssecureapps → Enable → Try logging in w/Thunderbird again

Type Arrows in Regular Text

Problem: You're typing an email, a message, a document, a blog or some other such thing that doesn't have an "Insert Symbol" function and you want to put some arrows in it.

Solution: Go to Wikipedia's Arrow (symbol) page → highlight the arrow you want → copy (Ctrl+C) & paste (Ctrl+V)