What was the first molecule in the universe? How long do neutrons live? Find out in ScienceSeeker's picks of the best posts for the week of April 15 - April 21, 2019 #SciSeekPicks #SciComm.

An 'Ecology in the cities' theme has emerged this week, with many excellent posts exploring what effects our most inhabited areas have on the wildlife that live there. Find this and many other important topics covered in the ScienceSeeker editors' round up of their favourite posts of the week within their respective areas of interest and expertise:

• Astronomers have spotted the universe’s first molecule by Daniel Clery for Science magazine.

  

  It sounds like this molecule has a devious plan.
  Credit: Andy Extance via Imgflip.

• 10 deep lessons from our first image of a black hole’s event horizon by Ethan Siegel at Starts With A Bang.
• How long do neutrons live? Physicists close in on decades-old puzzle by Alexandra Witze for Scientific American.
• Smiling can make us feel little bit happier, review says by Sci-News.com.
• A good action plan protects your goals from the negative impacts of anger, study finds by Eric W. Dolan via PsyPost.
• #AskFlipScience: Why are some people 'night owls'? by Kyle Edralin on FlipScience.
• The internet of thoughts is coming by Andrew Masterson for Cosmos Magazine.
• New paper proposes a science-based ‘Global Deal for Nature’ by Mongabay
• Appearance of new species after mass extinction obeys evolutionary ‘Speed limit’ by GrrlScientist via Medium.
• Science for cities: Overcoming borders by Michele Acuto for Elephant in the Lab.
• Cities may save some species from extinction, but they don’t save species’ ecological functions by Mike Gaworecki for Mongabay.
• Urban “wastelands” are a paradise for bees by Brandon Keim for Anthropocene magazine.
• Scientists uncover California's hidden earthquakes by Shannon Hall for Scientific American.
• Let’s paint the town green! by Cassidy Hanson for Envirobites.
• The science of colors and the colors of science by Allan Lasser for Massive Science.
• How much fat can you lose? by Monica Reinagel for Scientific American.
• The dark side of the immune response: how antibodies can facilitate the spread of Zika virus by Zani Ashley for ImmunoBites.
• A molecular octopus for capturing cancer cells by Marina Philip for Chembites.
• Rachel Houten’s journal round-up for 22nd April 2019 by Rachel Houten on AHEblog.
• Partially reviving dead pig brains by Steven Novella for NeurologicaBlog.

Check back next week for more great picks!