You can't, but you have choice not to eat it. Just like people have a choice not to eat fast food or junk food.
Cisco is currently selling the Unified Communications and offering cash for old PBX systems.
Supermarkets have computer systems for receiving payments during checkout, recording sales and keeping customer information.
Yes
PCBs have serious poisons which have been shown to cause damage to the reproductive, neurological and immune systems of wildlife and humans and are known to cause cancer so yes they are poisonous.
One can find information on clocking systems at Time Clock Window. This website is selling a software for time-keeping as well. Also they're selling the software for 60 dollars.
According to 'Wikipedia" the following are the best selling games systems of this year; Pacman and Pitfall for Atari 2600, ColecoVision games, and Microsoft Xbox Halo2, Halo Combat evolved to name a few.
It is thought that chocolate can be poisonous to mice, but only in large amounts. Chocolate is poisonous to most all animals when consumed in large amounts.
Supermarkets use lasers for various purposes such as scanning barcodes on products for pricing and inventory management, detecting counterfeit money, and enhancing security systems by monitoring and tracking movement within the store.
Many steel tanks are used for potable water systems if protected properly
Stars and any associated solar systems, dust, some gases and (potentially) dark matter.
The top selling stereo systems for 2011 were Kenwood, Visio, LG and Sony. A cheap brand that had high sells volume was Emerson. Bose sells a really good stereo system/speaker set for cars and home entertainment.
Selling of main and complimentary products so that the customer gets a solution under one roof (from one seller only) to solve his problem / need