The mathematician Charles Lutwidge Dodgson posed a big question about mirrors in one of his best-known books: Through the Looking-Glass (yup, Dodgson's pen name was Lewis Carroll). Natasha Gostwick of Storynory reads an excerpt that gets at the heart of the trouble: is mirror milk any good to drink? ...

Just after the Big Bang, the universe was a primordial soup made of light. Then, it started belching out matter. Neil deGrasse Tyson explains how deeply shocking this is, and Marcelo Gleiser reveals an imperfection in the laws of physics that makes our very existence possible.