[NEWS] Five D-Brief links: rats and cars, gravitational lensing, black holes, geodes, dark matter

• D-Brief notes the glorious science produced by scientists who trained rats to drive miniature cars and found that, in so doing, the rats’ stress was relieved.
• D-Brief reports on how scientists used gravitational lensing to study a galaxy nine billion light-years away.
• D-Brief explains how, in dwarf galaxies, supermassive black holes can stop star formation.
• D-Brief looks at how scientists have found the giant Geode of Pulpi was created.
• D-Brief notes how dark matter is making some spiral galaxies rotate at well over 500 kilometres a second.