• Discover and buy more of Ben’s cartoons here

• Order your own print of this cartoon from the Guardian Print Shop

Archaeologists say stencil painted with ochre in limestone cave on Muna Island was created at least 67,800 years ago

The faded outline of a hand on a cave wall in Indonesia may be the world’s oldest known rock art, according to archaeologists who say it was created at least 67,800 years ago.

The ancient hand stencil was discovered in a limestone cave popular with tourists on Muna Island, part of south-eastern Sulawesi, where it had gone unnoticed between more recent paintings of animals and other figures.

Veronika’s improvised grooming device has caused great surprise – but that tells us more about humans than cows

I have a farmer friend who regularly regales me with colourful stories of her cattle. Take the time when a beef cow called Noisette used her tongue to pull back the catch on the door of her pen so she could steal cattle nuts from the nearby feed bin. Or the time when she did it again, not to let herself out, but seemingly to stand back and watch as her freed compatriots “mooched around and caused mayhem.”

Where others see a herd of cows standing around looking bored, my friend sees a soap opera, with characters and plot twists. Cows, she tells me, learn quickly, bore easily and have an indefatigable penchant for mischief.

Helen Pilcher is a science writer and the author of Bring Back the King: The New Science of De-Extinction

Amateur conservationist and social media influencer Theerasak 'Pop' Saksritawee has a rare bond with Thailand’s critically endangered dugongs. With dugong fatalities increasing, Pop works alongside scientists at Phuket Marine Biological Centre to track the mammals with his drone and restore their disappearing seagrass habitat. Translating complex science for thousands online, Pop raises an urgent alarm about climate change, pollution and habitat loss — before Thailand’s dugongs vanish forever

As a study says a pet death can hurt as much as that of a relative, three people describe their emotions

Grief over the death of a pet could be as chronic as that for a human family member, according to research. The study, published in the academic journal PLOS One, suggests grieving pet owners can suffer from prolonged grief disorder (PGD).

PGD is a mental health condition that can last months or even years, and often involves intense longing and despair, and problems socialising and going about daily tasks. Currently, only those grieving the loss of a person can be diagnosed.

For three weeks, I wore stickers on my skin supposed to address all sorts of conditions. Are they a panacea, problem or performance?

This morning, I woke up feeling a little groggy. My go-to remedy is usually a coffee and cold-water face plunge, followed by a compulsive phone scroll. But today called for something more, so I unpeeled a small, yellow “energy” patch the size of a walnut, popped it on to my upper arm and hoped for the best.

The patch (£12 for 30) contains – so the packaging says – vitamins B5, B3 and a “microdose” of caffeine. It is made by Kind Patches, which is one brand in an increasingly crowded market of wellness stickers that claim to treat everything from lack of sleep to period pains to pimples. They are coin-sized, and often come in TikTok-friendly shades of sunflower yellow and peachy orange: you may have seen a teenager sporting a star-shaped one on their face to treat spots, or influencers patting blue magnesium ones on their wrists before bed.

These microscopic mites, which burrow under your skin and cause ferocious itching, are incredibly hard to get rid of – and cases in the UK have soared. What is causing the outbreak, and is there anything we can do about it?

Louise (not her real name) is listing the contents of a bin liner she has packed with fresh essentials in case of emergency. Clothes, toothbrushes, hairbrushes, a teddy … “Although it should be two teddies,” she re-evaluates, quickly. I can hear her trying to quell her panic.

A diehard survivalist preparing for catastrophe? Actually, a beleaguered 44-year-old mother recovering from scabies – an itchy rash caused by microscopic mites that burrow under human skin. Far-fetched as it sounds, emergency evacuation is exactly what she, her partner and children (six and four) resorted to in November in a desperate bid to beat the bugs. She is now on tenterhooks in case they return.