How does class affect how much sleep you get? Could sugary drinks be causing colon cancer in young people? Find out in ScienceSeeker's picks of the best posts for the week of June 28 - July 4 2021 #SciSeekPicks #SciComm.

In this week's cream of the crop of science news from around the world, discover the unsung hero behind every coronavirus survival story: our immune systems, and explore the growing link between gut microbiome and mental health. ScienceSeeker editors' favourite posts within their respective areas of interest and expertise also cover many other important and exciting topics. Why not have a read, inform yourself, and indulge your scientific curiosity?

• The great sleep divide by Katherine Ellison for Knowable magazine.

Inadequate sleep among low-income adults and racial minorities contributes to higher rates of illnesses, including cardiovascular disease and dementia.
Credit: Jeffery Bennett via Flickr (CC BY-SA 2.0)

• A year ago, Black physicists at Fermilab demanded change. What’s happened? by Jeffrey Mervis for Science.
• Colon cancer is rising in younger adults. Do sugary drinks play a role? by Nicholas Bakalar for The New York Times.
• Paper wasps can recognize each other's faces, some broods more than others by Hayden Waller for Massive Science.
• The heroes you don’t hear about: Our immune system by Zahra Nasser for Science Borealis.
• How your gut microbiome influences your mental health by Shekhar Kedia for Bacterialworld.
• Alan Magee and the St. Nazaire Railroad Station by Russell Hobbie at Intermediate Physics for Medicine and Biology.
• World Firefly Day: Shining more light on glo-ing innovations by Riley Bell for Promega Connections.
• Graphene was found in a meteorite! by Tony Jia for Sciworthy.
• Black holes swallow neutron stars in a single bite, new results suggest by Maddie Bender for Scientific American.
• Why cast regolith could be our key to lunar base construction by Miklos Bolza for Lab Down Under.
• Clean energy for clean transportation in India by Sameer Kwatra and Nitish Arora for NRDC.
• Which crops can survive drought? Nanosensors may offer clues by Keith Gillogly for Wired.

To indulge your curiosity even more, follow us on Facebook or Twitter for honourable mentions of great posts that didn't quite make our #SciSeekPicks list this week. Want #SciSeekPicks to help satisfy your scientific curiosity every week? Sign up here for regular notification emails.

Check back next week for more great picks!