Houghton Mifflin Harcourt Publishing

Roy Redford

Erica Vente is awful. She lectured us because we are so beneath her, she is white and we are Latinos. She can not even hide how she hates us

Rita Madden

Any place associated with Erica Vente deserves -1. She is rude and horrible

Andrew Robinson

I am very disappointed in this company. In their text book on chemistry, unit 2, lessons 1, exploration 3, at the end of the lesson they say that you can round the average atomic mass to find the most common isotope of an element. However, if you look at Copper and it's isotopes, the average atomic mass of Copper is 63.55, meaning that it's most common isotope should be Copper-64, however Copper-64 does not exist in nature. I will fix this review once the online textbook is fixed.