In an amusing review, StereoTimes, compared the the Sonic Impact T-Amp (shown here), a new $30 dollar digital amplifier, just slightly unfavorably to audiophile equipment costing $5000.

The T-Amp’s perceived clarity allows sound-staging and stereophony to reach hallucinatory stereoscopy: near-field listening with the Celestion F15’s revealed a stereo illusion that would satisfy even [...]

I’ve now learned a number of methods for solving tough Sudoku puzzles by hand, including X-Wing, Swordfish, Jellyfish, Squirmbag, Turbot-fish, XY-Wing, XYZ-Wing, Conjugate Pairs, Bowman Bingo, Simple Coloring, Super Coloring and Tabling.
I have not yet found a single website that explains all of these techniques in one location, so I thought I’d provide some links [...]