Our weekly news round-up: TESS exoplanet hunter successfully launched toward unusual lunar resonant orbit; The many, varied (and slightly scary) ways Facebook gathers information about you; World heritage Henderson Island in the remote South Pacific has the planet's worst plastic pollution; Japanese researchers make an enzyme that breaks down PET plastic bottles; Woolly mammoths and many other large mammals declined with people's migration out of Africa; Gmail hacked by spam scam - users receive messages from themselves; Lyrids meteor shower worth a look; Digital medical consultations via Coviu, a cloud-based video platform; Extracting gold from SIM cards to reduce e-waste; Grasshopper - a free app to learn the basics of coding.