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.

Low quality popscience with no integrity I used to love Nat Geo's magazines and read stacks of old issues almost cover to cover back when I assumed that the content was genuine and scientific. The illusion first shattered when I discovered the "Dog Whisperer" TV show that masqueraded abuse as dog training, and saw that Nat Geo just ignored all the damning critique from highly educated actual behaviour specialists, who implored them to stop the show because it is 1. unscientific, and 2. likely to harm many pet dogs as viewers try to emulate Millan's methods from the popular show. Nat Geo continued the show year after year because the show is popular, and because science, ethics and integrity apparently does not matter... all the sciency gloss is just pretend

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!!!

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.

Fire customer support people Just had the most ridiculous conversation with not 1 but 2 (supervisor) customer service people..... First from Philippines who COULD NOT UNDERTAND AND ANSWER BASIC QUESTIONS RE: no issues received for 3 months. Both she and supervisor (American who spoke English) could not listen or understand the problem. Each gave different info re: problem, then adding 3 more problems. Glad to find N G complaint site....seems I experienced same problems with customer service. Simple questions, rude etc etc etc....... ....will not renew current sub...