There are many grammatical errors There are many grammatical errors in the book. It doesn't mention a lot of exceptions. So the students have a lot of questions and it's really difficult for the teacher to handle all of them.

Down the Tubes I have been a National Geographic member/subscriber for over 50 years. I read my parents magazines for almost 20 years before that. I will be a member no longer. I can no longer tolerate the racist, sexist bent of this once vibrant magazine. The editor has brought her lack of scientific background and personal prejudices to bear on her work--where it has no place. Every issue is has become a far left opinion piece instead of fact-based story with broad interest. Too bad.

For a magazine of such standing National Geographic Digital … For a magazine of such standing, I am sorry to say that their digital version service is atrocious ! I have a paid membership which does not allow me to read any articles which are emailed to me on a daily basis. I have tried every single path, to read the articles, to no avail. A total waste of money!!

Subscription to spam National Geographic used to be a very respected journal. Now, they teamed up with Lindblad Expeditions. Once you subscribe to National Geographic, they sell your address to Lindblad Expeditions without asking for your permission, and you start getting catalogues of offensively expensive travel offers, tens of thousands of dollars per trip, from Lindblad Expeditions, and it is impossible to stop. Cancelled National Geographic because of Lindblad Expeditions spam. Called National Geographic for help to stop the spam. Looks like the spammers may be their partners. The frequency of spam got less but did not stop. Please, save your sanity and DO NOT SUBSCRIBE TO NATIONAL GEOGRAPHIC!!!

Dear CEO and others Dear CEO and others, Your information is very reliable, isn't it? I guess all you think about Africa is that they have no food and no water and they're poor awww so sad. but no, you guys don't have a big enough brain to understand the beauty of Africa, at least explain that and quit the stupidity.