CONTENTS

REGULARS

06 EYE OPENER

The best science images from around the world.

10 FEEDBACK

See what phy s ic a l and elec t ronic mail ha s a r r i ved this month.

13 DISCOVERIES

All the month’s biggest news s tor ie s : F i r s t ev idence o f low-frequency gravitational waves detec ted; The weal t hy look set to pay more for the switch to renewable energy; Tiny worms use electric f ields to hitch a ride on passing bees ; The r adio ac t i ve ‘ belch’ that’s echoing across our galaxy; Faecal transplant trial to begin in t he UK ; How space travel weakens astronauts’ immune s y s tems ; How A I i s being used to predict your per f ec t play l i s t .

26 DR KATIE MACK

Why theory is vital for shaping experiment… and vice versa.

46 SUBSCRIBE TODAY!

Get 3 i s sues f or £5 and s ave 30% on the shop price when you take out a subscription to BBC Science Focus.

28 DR DEAN BURNETT

Loud confidence beats quiet expertise more often than not… and it ’s evolu t ion’s f aul t .

30 DR MICHELLE

GRIFFIN The vagina is a treasure chest of medical potential for women. We just need to learn more about it .

32 REALITY CHECK

The science behind the headlines: Can mewing improve your jawline? Could aliens be signalling us using black holes? What are the risks of becoming a father late in life?

39 INNOVATIONS

The hottest trends shaking up the tech world.

72 Q & A

Our experts answer your questions. This month: How radioactive is my house? Why i s s a l t y f ood so satisf ying? How do varifocal glasses work? And more…

82 THE EXPLAINER

Every thing you wanted to know about the possibility of life on other planets.

89 CROSSWORD

Engage your grey matter!

89 NEXT MONTH

A sneak peek at the ne x t i s sue.

90 POPCORN SCIENCE

Could turtles ever master martial arts?

4

13

DISCOVERIES

32

REALITY CHECK

New findings provide evidence of low-frequency gravitational ‘ripples’ flowing across spacetime.

Mewing is the hot social media trend that claims to improve your jawline. But does it work?

72 Q&A