Beautiful, absolutely beautiful. I wish I had more stars to give and more pages to read. 
 Honestly this review covers only the eponymous story and I read it after watching first trailer of 'Arrival'. Expected something of Contact sort, never in my head crossed what it really was during the speculative process of determining what it could be. The writings of a mom to her daughter, those wore some of the most beautiful things I have ever read. I found myself standing in train absorbed in the copy, never caring to check for seats or station. 
 Big alien ships out of nowhere like Childhoods End all over the world and a linguist is hired by government to establish communication with the visitors. Stuff like Calculus of variation and Fermat principle of least time seems elementary to them, the very stuff I dozed off in last weeks lecture series. Now I am stuck with Whorfianism and sorts like below in my head. Human ear is adapted for the sounds of human larynx and so forth with every other sensory elements, and perception outside usual neurotic receptions would certainly be overwhelming. Also we as well maybe limited in our capabilities and thought processes by our language and senses. 
 Anything more will be rendition and spoilers. And keep an eye on the usage of tenses through out the read. Totally a non zero sum game :)