I will show you how to make a mini usb air conditioner to use it on your office at the hot days. We need:1) A plastic jar ( i use a plastic jar from a yogurt)2) A fan ( i use a fan from an old Pc, if use a bigger fan will be better)3) A usb cable4) A glue5) A tape6) A nail or something that can open holes on the jar7) A slitter8) Water ice cubesStep 1: Open a hole in the lid of the jar so the air from the fan can pass in the jar.Step 2: Open small holes in the lid with the nail so the air can recycleStep 3: Use the glue to stick the fan on the lidStep 4: Open a hole on the plastic jar (not a big hole!)Step 5: Connect usb cable with the fan, its easy, usb red wire with fan red wire and black wire usb with black fan wire and use tape to insulation.Step 6: Put water ice in the jar and close the lid. Step 7: Now connect usb on the pc and stay COOL :)