Welcome to another edition of the SlashGear Week in Review! Early Monday I ran across a cool printer hack that turns your ink jet into a printer that prints with invisible ink. The ink is lemon juice and the person that needs to read the invisible ink sprays it with an iodine solution to make the letters viewable. The commercial for the Touchwood SH-08C from DoCoMo has turned up on YouTube. The commercial uses a big handmade wooden ramp with xylophone keys that play classical music when a ball rolls down the ramp.