There will be a talk about "dermatopias" on Tuesday August 20th. If you want to attend to the talk and it is at the same time than my class, it is ok. However, if you want to justify your absence from the class, please send me a report (max. 300 words, min. 250 words) about it. This way you will not have a "falta". Please let me know if you have any questions.