# 174: Science Highlights Daily | 2019-02-02

This is a curated articles about the latest discoveries in science and interesting articles tackling technology and society.

Your gut bacteria may match your blood group – but we don’t know why: Yvaine Ye

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A study of over 100 people in China has found that gut bacteria seem to match their host’s blood group, but we don’t know how or why they do this yet

Mind-controlled robot lets you weld metal without using your hands: Donna Lu

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Car factories could one day use mind-controlled robotic welders to help keep machine operators at a safe distance

Rhinoceros beetles have weird mouth gears that help them chew: Michael Marshall

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Japanese rhinoceros beetles have a simple gearing mechanism that ensures their mouthparts move in synchrony and helps them chew tough bark

The Milky Way may be slowly devouring a hidden neighbouring galaxy: Leah Crane

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There is a huge stream of gas orbiting with our galactic neighbours, and it may come from a nearby unseen dwarf galaxy that is being consumed by the Milky Way

We’ve hacked the Curiosity rover to learn how mountains form on Mars: Leah Crane

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Hacking the Curiosity rover let researchers measure the density of the rocks it was driving over, revealing that Martian mountains may not form how we thought

Self-growing material could make muscles that become stronger with use: Donna Lu

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A self-growing hydrogel becomes stronger and larger with use and could one day help make robots with artificial muscles

Deep-sea mining could wreck the last unexplored ecosystem on Earth: Olive Heffernan

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As mining firms begin tests to pick up metal ores from the Pacific seabed, we need rules to protect this unusual ecosystem, says Olive Heffernan

Gum disease and Alzheimer’s: Your questions answered: Debora MacKenzie

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People are questioning a landmark study suggesting that a bacterium involved in gum disease may also cause Alzheimer's. Here's what you need to know about the study

So long, veganuary: Here’s how to consume consciously year round: P. K. Newby

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Cutting out meat and dairy products is a great way to save the world from your dinner plate, but there are many more, says P. K. Newby

We may finally know what causes Alzheimer’s – and how to stop it: Debora MacKenzie

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Evidence is growing that a bacteria involved in gum disease causes Alzheimer's, raising hopes over new kinds of treatments that are currently undergoing testing