𝗛𝗼𝘄 𝗮𝗿𝗲 𝗮𝘁𝘁𝗲𝗻𝘁𝗶𝗼𝗻 𝗮𝗻𝗱 𝘀𝗲𝗹𝗲𝗰𝘁𝗶𝗼𝗻 𝗿𝗲𝗹𝗮𝘁𝗲𝗱? Great thread by Alon Zivony.