How can you slay seasonal affective disorder? What happens when climate sceptics have a point? Find out in ScienceSeeker's picks of the best posts for the week of November 12-18 2018 #SciSeekPicks #SciComm

This week's best science stories include a nanoscale journey across your tabletop, Spain banning alternative medicine in state health centres, and a crater the size of Paris. But there are many other topics touched on in ScienceSeeker editors' favourite posts within their respective areas of interest and expertise for the past seven days. Here is the full round-up of the ScienceSeeker Editors’ Selections:

An aerial view of northwest Greenland, with the location of 

what appears to be a giant impact crater circled in red.

Credit: Natural History Museum of Denmark

• Zack’s Nano Adventure by Zachary Jones at Sustainable Nano
• Scientists Spot What May Be a Giant Impact Crater Hidden Under Greenland Ice by Meghan Bartels at Space.com
• New paper claims that LIGO’s gravitational wave detection from a neutron star merger can’t be right by Sabine Hossenfelder at Backreaction
• Kilogram to be defined by Planck constant instead of a lump of metal by Leah Crane at New Scientist
• A Grading Strategy That Puts the Focus on Learning From Mistakes by Katrina Schwartz at KQED/Mindshift
• Four Tips for Slaying Seasonal Affective Disorder by Kate Harveston at HeadStuff
• Students who limit use of Facebook, Snapchat, and Instagram see significant reductions in loneliness and depression at PsyPost
• Relationship between the need for cognitive closure and multitasking by Ewa Szumowska at Science Trends
• Podcast: Babies and Chimps Share a Laugh by Christopher Intagliata at Scientific American
• Spain Seeks to Ban Alternative Medicine by Steven Novella at NeurologicaBlog
• Is Cancer Elimination Really a Mission Impossible? by Jason Tetro at Oncobites
• Science vs. Superbugs: A New Wave of Solutions Is On the Way by Peter Rejcek at SingularityHub
• Is there such a thing as the "placebome"? by Orac at Respectful Insolence
• WHO director-general: Violence in DRC is allowing Ebola to spread by Helen Branswell at STAT
• With machine learning, researchers get new clues in the hunt for the source of mysterious viruses by Drew Joseph at STAT
• Immune system ‘negotiations’ stop mom’s body from attacking her fetus by Elizabeth Pennisi at Science
• Researching Humanitarian Affairs: Normative Issues, Research Gaps, and Methodological Challenge by Sassan Gholiagha at Orders Beyond Borders
• When climate change contrarians actually have a point by Greg Fish at World of Weird Things
• The many ways climate change worsens California wildfires by Dana Nuccitelli at Skeptical Science

Check back next week for more great picks!