Why must dark energy exist? Why are good bugs dying? Find out in ScienceSeeker's picks of the best posts for the week of September 17-23 2018 #sciseekpicks #scicomm

This week's best science stories include why many men feel sad after sex, exciting new pictures from a satellite that's hunting planets around stars far, far away, and a lot of old ideas being overturned. 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:

TESS took this snapshot of the
Large Magellanic Cloud (right) and
the bright star R Doradus (left)
with just a single detector of one
of its cameras on August 7.
Image credit: NASA / MIT / TESS

• NASA’s Planet-Hunter TESS Captures Its First Science 
• Images at Sci-News.com
• Spock’s home world has been discovered (sort of) by Dan Clery at Science
• This Is Why Dark Energy Must Exist, Despite Recent Reports To The Contrary by Ethan Siegel at Starts With a Bang!
• The Shadows of Our Spacecraft by Caleb Scharf at Life, Unbounded!
• International survey finds over 40 per cent of men have experienced “post-coital dysphoria” by Emma Young at British Psychological Society Research Digest
• Scientists identify four personality types by Ben Guarino at Speaking of Science
• Magic Mushrooms For Your Mental Health by Lauren Parikhal at Science by Lauren
• Glioblastoma: John McCain’s final battle by Megan Kirchgessner at NeuWrite San Diego
• Google AI Tool Identifies a Tumor's Mutations From an Image by Megan Molteni at Wired 
• Podcast of the week: Infective Heredity by Soren Wheeler, with David Quammen at Radiolab
• World Alzheimer’s Day 2018 by Roisin Coneely at Seeking Science
• A Run of Contrary Results by Derek Lowe at In The Pipeline
• The importance of data in biomedical research. at Qul Mind
• California plans to show the world how to meet the Paris climate target by Dana Nuccitelli at Skeptical Science
• Levee and Super Levee at Science, Engineering and Sustainability
• Why Are Beneficial Bugs Disappearing? by Seth Borenstein at KQED Science
• As turtles go, so go their ecosystems by Shreya Dasgupta at Mongabay
• Is this the oldest animal on Earth? by Andrew Masterson at Cosmos 
• Stabilizing Selection: Examples And Definition by Daniel Nelson at Science Trends
• Titans of Mathematics Clash Over Epic Proof of ABC Conjecture by Erica Klarreich at Quanta Magazine
• NIH Policies to Address Sexual and Gender Harassment in NIH-supported Extramural Research by Mike Lauer at Open Mike
• Teachers' Strategies for Pronouncing and Remembering Students' Names Correctly by Gail Cornwall at KQED News

Check back next week for more great picks!