I really bought this (at a charity sale) because I thought either my son or my grandson would be interested in it. And it looked really interesting. So I am half thinking about keeping it for myself rather than passing it on though younger generation who will probably decide that you can get better information "online". At least this is the feedback that I've just had from my son. Both boys are doing microbiology linked degrees at university and this looks like cute a helpful handbook and is beautifully illustrated. I really like it. So four stars from me. And grandson is going to get it in the mail ........and have to at least pretend that he finds it useful. ( )