If you’ve spent any time reading nerdy blogs or pop-science books, you probably know that outer space isn’t just made up of nothing. There’s something out there called dark that makes up a massive percentage of the big inky absence. You’re actually being bombarded with dark matter particles as you read this. The Cosmic Cocktail: Three Parts Dark Matter is physics professor Katherine Freese’s guide to dark matter, from the story of its discovery to possible future applications of this research. You’ll never look at the void between stars in the same way again. (Town Hall, 1119 Eighth Ave, townhallseattle.org, 7:30 pm, $5)