Can plants hear?

Flora may be able to detect the sounds of flowing water or munching insects

Pseudoscientific claims that music helps plants grow have been made for decades, despite evidence that is shaky at best. Yet new research suggests some flora may be capable of sensing sounds, such as the gurgle of water through a pipe or the buzzing of insects.

In a recent study, Monica Gagliano, an evolutionary biologist at the University of Western Australia, and her colleagues placed pea seedlings in pots shaped like an upside-down Y. One arm of each pot was placed in either a tray of water or a coiled plastic tube through which water flowed; the other arm had dry soil. The roots grew toward the arm of the pipe with the fluid, regardless of whether it was easily accessible or hidden inside the tubing. “They just knew the water was there, even if the only thing to detect was the sound of it flowing inside the pipe,” Gagliano says. Yet when the seedlings were given a choice between the water tube and some moistened soil, their roots favored the latter. She hypothesizes that these plants use sound waves to detect water at a distance but follow moisture gradients to home in on their target when it is closer.

The research, reported earlier this year in Oecologia, is not the first to suggest flora can detect and interpret sounds. A 2014 study showed the rock cress Arabidopsis can distinguish between caterpillar chewing sounds and wind vibrations – the plant produced more chemical toxins after “hearing” a recording of feeding insects. “We tend to underestimate plants because their responses are usually less visible to us. But leaves turn out to be extremely sensitive vibration detectors,” says lead study author Heidi M. Appel, an environmental scientist now at the University of Toledo.

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Warming

Changes

Most people today have a mobile phone. In fact, many people can't imagine how they ever got along without a portable phone. However, many people also complain about cell phone users. People complain about other people loudly discussing personal matters in public places. They complain when cell phones ring in movie theaters and concert halls. They complain about people driving too slow, and not paying attention to where they are going because they are talking on a cell phone. And they complain about people walking around talking to people who aren't there.

Whenever a new communications technology becomes popular, it changes the way society is organized. Society has to invent rules for the polite way to use the new devices. Our social etiquette, our rules of politeness for cell phones, is still evolving.

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AUGUST 2017 WAS THE SECOND WARMEST ON RECORD

August 2017 was the second warmest August in 137 years of modern record-keeping, according to a monthly analysis of global temperatures by scientists at NASA's Goddard Institute for Space Studies (GISS) in New York.

The measured value is consistent with the trend in global average surface temperatures that has been observed during the past few decades. Last month was +0.85 degrees Celsius warmer than the mean August temperature from 1951-1980.

It was surpassed by August 2016, which was still affected by the 2015-2016 El Niño and was 0.99 degrees Celsius warmer than normal. However, August 2017 was about +0.2 degrees warmer than the August following the last large El Niño event in 1997-1998.

The monthly analysis by the GISS team is assembled from publicly available data acquired by about 6,300 meteorological stations around the world, ship- and buoy-based instruments measuring sea surface temperature, and Antarctic research stations.

The modern global temperature record begins around 1880 because previous observations didn't cover enough of the planet. Monthly analyses are sometimes updated when additional data becomes available, and the results are subject to change.

In the comic strip, one of the girls is upset.

Can plants hear?

Flora may be able to detect the sounds of flowing water or munching insects

Pseudoscientific claims that music helps plants grow have been made for decades, despite evidence that is shaky at best. Yet new research suggests some flora may be capable of sensing sounds, such as the gurgle of water through a pipe or the buzzing of insects.

In a recent study, Monica Gagliano, an evolutionary biologist at the University of Western Australia, and her colleagues placed pea seedlings in pots shaped like an upside-down Y. One arm of each pot was placed in either a tray of water or a coiled plastic tube through which water flowed; the other arm had dry soil. The roots grew toward the arm of the pipe with the fluid, regardless of whether it was easily accessible or hidden inside the tubing. “They just knew the water was there, even if the only thing to detect was the sound of it flowing inside the pipe,” Gagliano says. Yet when the seedlings were given a choice between the water tube and some moistened soil, their roots favored the latter. She hypothesizes that these plants use sound waves to detect water at a distance but follow moisture gradients to home in on their target when it is closer.

The research, reported earlier this year in Oecologia, is not the first to suggest flora can detect and interpret sounds. A 2014 study showed the rock cress Arabidopsis can distinguish between caterpillar chewing sounds and wind vibrations – the plant produced more chemical toxins after “hearing” a recording of feeding insects. “We tend to underestimate plants because their responses are usually less visible to us. But leaves turn out to be extremely sensitive vibration detectors,” says lead study author Heidi M. Appel, an environmental scientist now at the University of Toledo.

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People often live in rural areas because they love a slower pace of life, fresh air, and being closer to nature. But a disturbing new report from the Centers for Disease Control and Prevention found that rural living comes with a scary side effect: A higher risk of dying from certain forms of cancer.

According to the report, which pulled data from 2006 to 2015, overall cancer deaths are falling in the U.S., but the numbers are higher and falling at a slower pace in rural areas. Specifically, there are 180 deaths for every 100,000 people who live in the country compared to 158 per 100,000 people in urban areas. Even more bizarre: Cancer rates are slightly lower in rural areas—there are 442 cases per 100,000 compared to 457 per 100,000 for their urban-living counterparts— but, again, more people are dying of cancer in these areas. The CDC specifically cited lung, colorectal, prostate, and cervical cancers as the biggest issues for people in rural areas.