Welcome to the new-look Lab Notes

Say hello ... Welcome to the new-look Lab Notes! Hopefully the new design will make it easier for you to get straight to the stories you find most intriguing – and as this week has involved a bumper crop of scintillating science (including signals from the cosmic dawn) that can only be a good thing. But while it's hello to the new design, it's also goodbye from me, as I leave the science desk for a new role. I hope you've enjoyed reading Lab notes as much as I've enjoyed compiling it and that you will like it even more in its new format. Yours, both in and out of the lab, Tash Reith-Banks @TashReithBanks This week's biggest stories Astronomy / Cosmic dawn: astronomers detect signals from first stars in the universe Health / Five categories for adult diabetes, not just type 1 and type 2, study shows Microbiology / Common human skin bacteria could protect against cancer, say researchers Anthropology / World's earliest figural tattoos discovered on Gebelein mummies Psychology / Hate body odour? You're more likely to have rightwing views Space / Deep-sea microorganisms could survive on Saturn's moon – in theory Evolution / Two become one: two raven lineages merge in 'speciation reversal' Eye on science 'Mega-colonies' of 1.5 million penguins discovered in Antarctica The discovery shows the remote area is a vital refuge for wildlife from climate change and overfishing and should be protected by a new reserve, say scientists Straight from the lab Notes & Theories / Mirrors have revealed something new about manta rays – and it reflects badly on us Lauren Smith Lost Worlds Revisited / Artist resurrects obscure fossils in gorgeous living colour Notes & Theories / Babies' sleep patterns can be challenging – here's why you shouldn't despair Alex Bellos's puzzle Can you solve it? Tapa, the puzzle of champions Alex's brainteaser this week is a sweetly challenging Turkish delight Did you solve it? The solutions to this week's puzzles Guardian News & Media Limited - a member of Guardian Media Group PLC. Registered Office: Kings Place, 90 York Way, London, N1 9GU. Registered in England No. 908396