Emacs tip of the day: winner-mode lets you undo changes to your window splits!
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The "line of death", where the browser UI splits between trusted UI elements and UI controlled by the website.
Also argues that HTTP warnings are better than HTTPS padlocks, because there's incentive to spoof padlocks lower on the page.
Emacs command of the day: balance-windows, bound to C-x +. If you've split the window, this ensures that all splits are the same size.
Emacs can be almost exclusively used with a keyboard. I find resizing splits to be really awkward without a mouse (what numeric arg to use?)