Tipping etiquette: With old norms gone, how do I know when to tip?

Apple wins tax battle against EU, avoids $15B fineNetflix loses nearly a million subscribers, but profits rise

This robot uses color cameras and AI to grab transparent objectsBreathtaking Hubble Image Captures a Star That's Still Being BornVoyager Spacecraft Detect an Increase in The Density of Space Outside The Solar System

UK bans Huawei from 5G network, citing security risks triggered by US sanctionsMicrosoft’s creepy teenage chatbot Xiaoice is getting its own company

There Are Snowcapped Mountains on Pluto, And We May Finally Know Why

Emilia Clarke reflects on "remarkable" ability to speak despite losing "quite a bit" of her brain to aneurysmsAstronomers Detect Millions of Signals From an Intelligent Civilization: Us

An Asteroid Made a Record Close Pass of Earth on Friday 13, And We Didn't See It ComingThere Was a Special, Extra Crew Member Onboard Yesterday's SpaceX Launch – Baby Yoda

Building Blocks of Life Can Be Forged by 'Dark Chemistry' Far From Stars or PlanetsUnexpectedly, The Universe Is Getting Hotter And Hotter as It Expands