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'Ghost tunnels' guide sound waves in one direction while staying invisible to others

Acoustic metamaterials are a fast-evolving family of materials which manipulate sound waves in ever more advanced ways. Now, a team led by Changqing Xu at Nanjing Normal University in China has engineered an acoustic metamaterial, a "ghost tunnel": a structure which acts as a near-perfect waveguide for sound entering through its ends, while being essentially invisible to waves incident on its sides. The results, published in Physical Review Letters, could open new avenues for manipulating sound waves in complex signal environments.

Science / PhysOrg / Apr 13 / 99% positive
low-angle photography of wheat near trees during daytime

Photo: Andy Vult / Unsplash

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New York, NY NY Post Apr 13
What Jets might do at cornerback in 2026 NFL Draft

The Post's Brian Costello examines what the Jets may do at cornerback in the 2026 NFL Draft.

New York, NY NY Post Apr 13
What Giants might do at cornerback in 2026 NFL Draft

The Post's Paul Schwartz examines what the Giants may do at cornerback in the 2026 NFL Draft.

Albany, NY NEWS10 ABC Apr 13
Giant troll sculptures coming to the Adirondacks

Six giant trolls are coming to the Adirondacks this summer with a mission to help humans rediscover nature and be good stewards of the earth. Thomas Dambo’s "TROLLS: Save the Humans" is coming to The Wild Center in Tupper Lake on June 1.

New York, NY NY Post Apr 13
Noah Kahan Reveals He Struggles with Disordered Eating, Body Dysmorphia in ‘Noah Kahan: Out of Body’ Netflix Documentary: “I Starve Myself”

"I get so hateful about my body, what I look like, that I don't eat for a while, starve myself," Kahan says in his new Netflix doc.

Columbus, OH NBC4i Apr 13
Watch: Coach Ryan Day looks ahead to Ohio State spring football game

COLUMBUS, Ohio (WCMH) -- It's less than a week until Ohio State's spring football game, which will serve as the final glimpse of next season's Buckeyes before the fall camp in August. Coach Ryan Day will address the media after practice Monday from the Woody Hayes Athletic Center. You can watch his comments live in [...]

Science Space.com Apr 13
Artemis 2: Our favorite photos from NASA's historic moon mission

The Artemis 2 mission to the moon beamed back some incredible photos, and we've rounded up the best ones.

Environment BBC Environment Apr 13
Surrey's blue tit bucks national trend in bird study

The blue tit is the most common bird spotted in Surrey, while the house sparrow is across the UK.

New York, NY NY Post Apr 13
Dramatic moment massive green fireball streaks across the skies in UK

Wild footage shows a green fireball streaking across the UK Monday morning, prompting stunned witnesses to quip it was linked to the Artemis II mission.

Environment BBC Environment Apr 13
Suspected meteorite caught on camera

Lex Adair noticed a bright light had crossed the night sky at about 00:30 BST.

New York, NY NY Post Apr 13
New York could see record heat this week with temps more than 30 degrees above average

Temperature records are set to tumble this week, with much of the Eastern United States seeing summer-like heat surges, while the warmer air is also set to push rain and storms north from the South.